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About random prefix attacks - DNS Firewall · Cloudflare DNS docs

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<span class="astro-3ii7xxms">Get started</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/concepts/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="large astro-3ii7xxms"> <span class="astro-3ii7xxms">Concepts</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="0"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">DNS setups</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="DNS setups"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="11"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Full setup</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/full-setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Full setup"> <span class="astro-3ii7xxms">About</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/full-setup/setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Setup</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/full-setup/troubleshooting/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Troubleshooting</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="12"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Partial (CNAME) setup</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/partial-setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Partial (CNAME) setup"> <span class="astro-3ii7xxms">About</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/partial-setup/setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Setup</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/partial-setup/dns-resolution/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">DNS resolution</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="13"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">DNS Zone transfers</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="DNS Zone transfers"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="24"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Cloudflare as Primary</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/cloudflare-as-primary/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Cloudflare as Primary"> <span class="astro-3ii7xxms">About</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/cloudflare-as-primary/setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Setup</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/cloudflare-as-primary/dnssec-for-primary/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">DNSSEC options</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="25"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Cloudflare as Secondary</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/cloudflare-as-secondary/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Cloudflare as Secondary"> <span class="astro-3ii7xxms">About</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/cloudflare-as-secondary/setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Setup</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/cloudflare-as-secondary/proxy-traffic/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Proxy traffic</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/cloudflare-as-secondary/dnssec-for-secondary/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">DNSSEC options</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/cloudflare-as-secondary/alerts/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Alerts</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="26"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Access Control Lists (ACLs)</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/access-control-lists/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Access Control Lists (ACLs)"> <span class="astro-3ii7xxms">About</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/access-control-lists/cloudflare-ip-addresses/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Cloudflare IP addresses</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/access-control-lists/create-new-list/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Create ACL</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/zone-transfers/troubleshooting/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Troubleshooting</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="14"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Subdomain setup</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/subdomain-setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Subdomain setup"> <span class="astro-3ii7xxms">About</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="27"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Setup</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/subdomain-setup/setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Setup"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/subdomain-setup/setup/parent-on-full/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Parent zone on full setup</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/subdomain-setup/setup/parent-on-partial/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Parent zone on partial setup</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/subdomain-setup/dnssec/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Enable DNSSEC</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/subdomain-setup/move-to-new-account/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Migrate to new account</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/subdomain-setup/rollback/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Rollback</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="15"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Reference</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/reference/nameserver-assignment/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Nameserver assignment</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/reference/dns-quick-scan/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Records quick scan</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/reference/domain-status/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Zone status</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="16"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Troubleshooting</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/troubleshooting/cannot-add-domain/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Cannot add domain</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/troubleshooting/delete-all-records/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Delete all DNS records</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/troubleshooting/domain-deleted/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Domain deleted from Cloudflare</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="17"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Setup conversions</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/partial-setup/setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Full to partial ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/conversions/convert-full-to-secondary/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Full to secondary</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/conversions/convert-partial-to-full/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Partial to full</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/conversions/convert-partial-to-secondary/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Partial to secondary</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/conversions/convert-secondary-to-full/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Secondary to full</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/conversions/convert-secondary-to-partial/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Secondary to partial</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/zone-setups/removal/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Zone removal</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="1"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Foundation DNS</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/foundation-dns/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Foundation DNS"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/foundation-dns/advanced-nameservers/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Advanced nameservers</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/foundation-dns/setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Setup</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="2"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Nameservers</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/nameservers/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Nameservers"> <span class="astro-3ii7xxms">About</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/nameservers/update-nameservers/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Update nameservers</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/nameservers/nameserver-options/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Nameserver options</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/foundation-dns/advanced-nameservers/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Advanced nameservers ↗</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="18"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Custom nameservers</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/nameservers/custom-nameservers/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Custom nameservers"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/nameservers/custom-nameservers/zone-custom-nameservers/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Zone level</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/nameservers/custom-nameservers/account-custom-nameservers/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Account level</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/nameservers/custom-nameservers/tenant-custom-nameservers/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Tenant level</span> </a></li> </ul> </details></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="3"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">DNS records</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="DNS records"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="19"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">How to</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/how-to/create-dns-records/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Manage DNS records</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/how-to/create-zone-apex/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Create zone apex record</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/how-to/create-subdomain/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Create subdomain records</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/how-to/email-records/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Set up email records</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/how-to/import-and-export/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Import and export records</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/how-to/batch-record-changes/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Batch record changes</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/how-to/managing-dynamic-ip-addresses/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Dynamically update DNS records</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/how-to/round-robin-dns/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Round-robin DNS</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/how-to/subdomains-outside-cloudflare/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Delegate subdomains</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="20"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Reference</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/reference/dns-record-types/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">DNS record types</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/reference/ttl/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Time to Live (TTL)</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/reference/record-attributes/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Record attributes</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/reference/wildcard-dns-records/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Wildcard DNS records</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/reference/vendor-specific-records/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Vendor-specific DNS records</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="21"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Troubleshooting</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/troubleshooting/records-with-same-name/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Records with the same name</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/troubleshooting/exposed-ip-address/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Exposed IP addresses</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/troubleshooting/cname-domain-verification/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Verify a domain with CNAME</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/manage-dns-records/troubleshooting/existing-ns-record/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">NS records already exist</span> </a></li> </ul> </details></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="4"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Proxy status</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/proxy-status/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Proxy status"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/proxy-status/limitations/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Limitations</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="5"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">DNSSEC</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dnssec/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="DNSSEC"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="22"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Multi-signer DNSSEC</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dnssec/multi-signer-dnssec/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">About</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dnssec/multi-signer-dnssec/setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Setup</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dnssec/dnssec-states/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">DNSSEC states</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dnssec/dnssec-active-migration/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Migration tutorial</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dnssec/troubleshooting/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Troubleshooting</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="6"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">CNAME flattening</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/cname-flattening/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="CNAME flattening"> <span class="astro-3ii7xxms">About</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/cname-flattening/set-up-cname-flattening/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Setup</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/cname-flattening/cname-flattening-diagram/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Example diagram</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="7"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Additional options</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/additional-options/dns-zone-defaults/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Zone defaults</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/additional-options/analytics/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Analytics and logs</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/additional-options/reverse-zones/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Reverse zones and PTR records</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details open class="astro-3ii7xxms"><sl-sidebar-restore data-index="8"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">DNS Firewall</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="DNS Firewall"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Setup</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/analytics/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Analytics</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/faq/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">FAQ</span> </a></li> <li class="astro-3ii7xxms"> <details open class="astro-3ii7xxms"><sl-sidebar-restore data-index="23"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Random prefix attack mitigation</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Random prefix attack mitigation"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="page" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">About</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Setup</span> </a></li> </ul> </details></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="9"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Reference</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/reference/analytics-api-properties/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Analytics API properties</span> <span class="sl-badge caution small astro-3ii7xxms astro-avdet4wd">Legacy</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/reference/recommended-third-party-tools/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Recommended third-party tools</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/reference/all-features/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Features and plans</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/reference/domain-connect/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Domain Connect</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="10"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Troubleshooting</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/troubleshooting/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Troubleshooting"> <span class="astro-3ii7xxms">Full resources list</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/troubleshooting/faq/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">General FAQ</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/troubleshooting/dns-probe-finished-nxdomain/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">DNS_PROBE_FINISHED_NXDOMAIN</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/troubleshooting/dns-probe-possible/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">DNS_PROBE_POSSIBLE</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/troubleshooting/email-issues/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Email issues</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/troubleshooting/dns-issues/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">General DNS issues</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/changelog/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="large astro-3ii7xxms"> <span class="astro-3ii7xxms">Changelog</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/dns/glossary/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" aria-current="false" class="large astro-3ii7xxms"> <span class="astro-3ii7xxms">Glossary</span> </a></li> </ul> <script aria-hidden="true"> (() => { const scroller = document.getElementById('starlight__sidebar'); if (!window._starlightScrollRestore || !scroller) return; scroller.scrollTop = window._starlightScrollRestore; delete 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${this.getAttribute("component-url")}`,n)}}attributeChangedCallback(){this.hydrate()}}d(y,"observedAttributes",["props"]),customElements.get("astro-island")||customElements.define("astro-island",y)}})();</script> <div class="lg:sl-hidden astro-pb3aqygn"> <mobile-starlight-toc data-min-h="2" data-max-h="3" class="astro-doynk5tl"> <nav aria-labelledby="starlight__on-this-page--mobile" class="astro-doynk5tl"> <details id="starlight__mobile-toc" class="astro-doynk5tl"> <summary id="starlight__on-this-page--mobile" class="sl-flex astro-doynk5tl"> <div class="toggle sl-flex astro-doynk5tl"> On this page <svg aria-hidden="true" class="caret astro-doynk5tl astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg> </div><span class="display-current astro-doynk5tl"></span></summary> <div class="dropdown astro-doynk5tl"> <ul class="isMobile astro-g2bywc46" style="--depth: 0;"> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#_top" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Overview</span> </a></li> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#attack-characteristics" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Attack characteristics</span> </a> <ul class="isMobile astro-g2bywc46" style="--depth: 1;"> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#queries-for-nonexistent-domains" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Queries for nonexistent domains</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#queries-for-nonexistent-subdomains" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Queries for nonexistent subdomains</span> </a></li> </ul></li> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#solution" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Solution</span> </a></li> </ul> </div> </details> </nav> </mobile-starlight-toc> <script type="module" src="/_astro/MobileTableOfContents.astro_astro_type_script_index_0_lang.CwvHEPnB.js"></script> </div> <div class="right-sidebar-panel sl-hidden lg:sl-block astro-pb3aqygn"> <div class="sl-container astro-pb3aqygn"> <starlight-toc data-min-h="2" data-max-h="3"> <nav aria-labelledby="starlight__on-this-page"> <h2 id="starlight__on-this-page">On this page</h2> <ul class="astro-g2bywc46" style="--depth: 0;"> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#_top" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Overview</span> </a></li> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#attack-characteristics" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Attack characteristics</span> </a> <ul class="astro-g2bywc46" style="--depth: 1;"> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#queries-for-nonexistent-domains" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Queries for nonexistent domains</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#queries-for-nonexistent-subdomains" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Queries for nonexistent subdomains</span> </a></li> </ul></li> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#solution" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Solution</span> </a></li> </ul> </nav> </starlight-toc> <script type="module" src="/_astro/TableOfContents.astro_astro_type_script_index_0_lang.CxWEh7Yp.js"></script><br><astro-island uid="ZcQfTO" prefix="r1" component-url="/_astro/FeedbackPrompt.sIVdSYEF.js" component-export="default" renderer-url="/_astro/client.BUsrUfVi.js" props="{}" ssr client="idle" opts="{&quot;name&quot;:&quot;FeedbackPrompt&quot;,&quot;value&quot;:true}" await-children> <div> <h2>Was this helpful?</h2><button class="cursor-pointer bg-transparent"> <svg stroke="currentColor" fill="currentColor" 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attack mitigation </a> <span class="c-breadcrumbs__separator" aria-hidden="true"> <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="astro-couag5ji"> <polyline points="9 18 15 12 9 6" class="astro-couag5ji"></polyline> </svg></span></li> <li class="c-breadcrumbs__crumb"><a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB" class="c-breadcrumbs__link is-current" aria-current="location"> About </a></li> </ol> </nav> </astro-breadcrumbs> <script 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class="astro-vjux6bgf"><symbol id="starlight-image-zoom-icon-zoom" viewbox="0 0 24 24" class="astro-vjux6bgf"> <path d="M9.79 12.79 4 18.59V17a1 1 0 0 0-2 0v4a1 1 0 0 0 .08.38 1 1 0 0 0 .54.54A1 1 0 0 0 3 22h4a1 1 0 0 0 0-2H5.41l5.8-5.79a1 1 0 0 0-1.42-1.42ZM21.92 2.62a1 1 0 0 0-.54-.54A1 1 0 0 0 21 2h-4a1 1 0 0 0 0 2h1.59l-5.8 5.79a1 1 0 0 0 0 1.42 1 1 0 0 0 1.42 0L20 5.41V7a1 1 0 0 0 2 0V3a1 1 0 0 0-.08-.38Z" class="astro-vjux6bgf" /> </symbol> <symbol id="starlight-image-zoom-icon-unzoom" viewbox="0 0 24 24" class="astro-vjux6bgf"> <path d="M21.71 2.29a1 1 0 0 0-1.42 0l-5.79 5.8V6.5a1 1 0 0 0-2 0v4a1 1 0 0 0 .08.38 1 1 0 0 0 .54.54 1 1 0 0 0 .38.08h4a1 1 0 0 0 0-2h-1.59l5.8-5.79a1 1 0 0 0 0-1.42ZM10.88 12.58a1 1 0 0 0-.38-.08h-4a1 1 0 0 0 0 2h1.59l-5.8 5.79a1 1 0 0 0 0 1.42 1 1 0 0 0 1.42 0l5.79-5.8v1.59a1 1 0 0 0 2 0v-4a1 1 0 0 0-.08-.38 1 1 0 0 0-.54-.54Z" class="astro-vjux6bgf" /> </symbol> </svg> </starlight-image-zoom> <script type="module" src="/_astro/ImageZoom.astro_astro_type_script_index_0_lang.BjAW4avr.js"></script> <div class="sl-markdown-content astro-cedpceuv"> <p>Random prefix attacks are when someone sends a lot of traffic to subdomains that are highly unlikely to exist (<code dir="auto">12345.example.com</code>, <code dir="auto">abcdefg.example.com</code>), but are still associated with your main domain (<code dir="auto">example.com</code>).</p> <p>Usually, a DNS query to each random subdomain (or prefix) is not repeated, so it cannot be cached by resolvers or any other proxies and always reaches the authoritative nameservers. Rate limiting or blocking queries based on source IP can introduce a high amount of false positives, since random prefix attacks commonly are conducted via public resolvers. This makes these attacks particularly effective and hard to mitigate.</p><br> <div tabindex="-1" class="heading-wrapper level-h2"> <h2 id="attack-characteristics">Attack characteristics</h2><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#attack-characteristics"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="queries-for-nonexistent-domains">Queries for nonexistent domains</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#queries-for-nonexistent-domains"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <p>If the request only involved nonexistent domains, the <code dir="auto">NXDOMAIN</code> errors would only be served by the top-level domain (TLD) nameservers for <code dir="auto">com.</code>. This means that the queries never reach the authoritative nameservers.</p> <pre class="mermaid" dir="ltr"> flowchart TD accTitle: Random prefix attacks diagram A[End user query to &lt;code&gt;example.com&lt;/code&gt;] --"1)"--&gt; B[&lt;code&gt;1.1.1.1 resolver&lt;/code&gt;] B --"2)"--&gt; C[&lt;code&gt;com.&lt;/code&gt; TLD NS] C --"3)" &lt;code&gt;NXDOMAIN error&lt;/code&gt;--&gt; B B --"4)" &lt;code&gt;NXDOMAIN error&lt;/code&gt;--&gt; A D[Authoritative NS] </pre><br> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="queries-for-nonexistent-subdomains">Queries for nonexistent subdomains</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#queries-for-nonexistent-subdomains"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <p>These attacks are successful because they target subdomains, which require a response from a domain's authoritative nameservers.</p> <pre class="mermaid" dir="ltr"> flowchart TD accTitle: Random prefix attacks diagram A[End user query to &lt;code&gt;random.example.com&lt;/code&gt;] --"1)"--&gt; B[&lt;code&gt;1.1.1.1 resolver&lt;/code&gt;] B -- "2)" --&gt; C[&lt;code&gt;com.&lt;/code&gt; TLD NS] C -- "3)" Query Authoritative NS --&gt; B B -- "4)" --&gt; D[Authoritative NS] D --"5)" &lt;code&gt;NXDOMAIN error&lt;/code&gt;--&gt; B B --"6)" &lt;code&gt;NXDOMAIN error&lt;/code&gt;--&gt; A </pre><br> <p>With an attack against a subdomain of an existing domain, the resolver is forced to fully resolve it against the authoritative nameservers since these random subdomains are likely not cached by the resolver or any other proxy. If an attacker sends enough of these queries, and the authoritative nameservers cannot handle the query load, it will become unresponsive or even fall over, taking all zones it is hosting down, not just the attacked zone.</p> <p>This attack is difficult to mitigate for a few reasons. From the perspective of the authoritative nameservers, the attacker appears to be Cloudflare (<code dir="auto">1.1.1.1</code>) since that is the source of the queries. Blocking Cloudflare is not an option since that will block legitimate traffic.</p> <div tabindex="-1" class="heading-wrapper level-h2"> <h2 id="solution">Solution</h2><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/about/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB#solution"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <p>When you <a href="https://developers-cloudflare-com.translate.goog/dns/dns-firewall/random-prefix-attacks/setup/?_x_tr_sl=pl&amp;_x_tr_tl=en&amp;_x_tr_hl=en-GB">enable random prefix attack mitigations</a>, Cloudflare monitors incoming queries for potential random prefix attacks.</p> <p>When we detect an attack, we will temporarily stop querying your upstream nameservers for subdomains, sub-subdomains, and more. 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