IP Addressing Services

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anchorChild[i].setAttribute('href', anchorChildHREF); } } } </script> <h1 id="fw-pagetitle" class="" data-owner="ID">IP Addressing Services</h1> </div> </div>  <div class="row full visitedlinks"> <div class="col full" > <div class="row wide-narrow" id="birthcert"> <div class="col wide"> <div class="desc-more hide"><p>An IP address is a 32-bit number written in dotted decimal notation: four 8-bit fields (octets) converted from binary to decimal numbers, separated by dots. The first part of an IP address identifies the network on which the host resides, while the second part identifies the particular host on the given network. The network number field is called the network prefix. All hosts on a given network share the same network prefix but must have a unique host number. In classful IP, the class of the address determines the boundary between the network prefix and the host number.</p></div> <div class="desc-less"><p>An IP address is a 32-bit number written in dotted decimal notation: four 8-bit fields (octets) converted from binary to decimal numbers, separated by dots. The first part of an IP address identifies the network on which the host resides, while the second part identifies the </div> <button class="readmore">Read more</button> </div> <div class="col narrow"> <button class="subp">Sub-Protocols</button> <ul id="subprotocols" class="cdc-expandPanel"> <li>Address Resolution Protocol (ARP)</li><li>Dynamic Address Allocation and Resolution</li><li>Access Lists</li><li>NBMA Address Resolution Protocol (NARP)</li><li>Next Hop Resolution Protocol (NHRP)</li><li>Reverse Address Resolution Protocol (RARP)</li><li>Network Address Translation (NAT)</li><li>Serial Line Address Resolution Protocol (SLARP)</li> </ul> </div> </div> <script type="text/javascript"> cdc.util.ensureNamespace("cdc.rc.techbc"); cdc.rc.techbc.morebutton = "Read more"; cdc.rc.techbc.lessbutton = "Read less"; </script> </div> </div> <div class="row full visitedlinks"> <div class="col full" > <div id="contactTrans"> <style> /* CAWI-7215 / irregular breakpoints */ @media only screen and (max-width: 430px) { .cdc-support-series .contactUs, .cdc-support-model .contactUs, .cdc-support-technology-series .contactUs, .cdc-support-multimedia-eot .contactUs, .cdc-eot-toc .contactUs{ font-size: 1.4rem; 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Saved documents for this product will be listed here, or visit the <a href="/c/en/us/support/saved/index.html">My Saved Content</a> page to view and manage all saved content from across Cisco.com. </span> <br><br> <span> <a href="/c/login/index.html?referer=/c/en/us/tech/ip/ip-addressing-services/index.html">Log in</a> to see your Saved Content. </span> </div> </li> </ul> </div> </div> </section> <div class="row full"> <div class="col"> <script src="/etc/designs/cdc/fw/clientlibs/granite-utils.min.js"></script> <script src="/etc/designs/cdc/fw/clientlibs/editbase_overrides.min.js"></script> <script type="text/javascript"> if (typeof(cdc) == "undefined") cdc={}; if (typeof(cdc.rc) == "undefined") cdc.rc={}; cdc.rc.mostRecent = "Most Recent"; </script>  <div class="documents-container"> <div id="actual-document-listings" class="more-documents"> <ul class="group"> <li><a name="TechnologyInformation" id="TechnologyInformation"></a> <h3>Technology Information</h3> <ul class='doc-sublist'> <h4>Technology Q&A</h4> <li> <h4>Network Address Translation (NAT)</h4> <ul class='doc-sublist'> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/218012-troubleshoot-network-address-translation.html' data-recentlyviewed='stdLink'>Troubleshoot Network Address Translation with Frequently Asked Questions </a><span class='most_recent_link_date' style='display:none'>24-Oct-2022</span></li> </ul> </li> <li><a href='/c/en/us/support/docs/ip/address-resolution-protocol-arp/117398-qanda-arp-timeout-00.html' data-recentlyviewed='stdLink'>ARP FAQ: Why are some dynamic ARP entries still present in the ARP table after the respective ARP timeout has expired? </a><span class='most_recent_link_date' style='display:none'>28-Jan-2014</span></li> </ul> <ul class='doc-sublist'> <h4>Technology White Paper</h4> <li> <h4>Access Lists</h4> <ul class='doc-sublist'> <li><a href='/c/en/us/support/docs/ip/access-lists/43920-iacl.html' data-recentlyviewed='stdLink'>Protecting Your Core: Infrastructure Protection Access Control Lists </a><span class='most_recent_link_date' style='display:none'>21-Oct-2008</span></li> <li><a href='/c/en/us/support/docs/ip/access-lists/43861-racl.html' data-recentlyviewed='stdLink'>GSR: Receive Access Control Lists </a><span class='most_recent_link_date' style='display:none'>23-Feb-2006</span></li> </ul> </li> </ul> </li> <li><a name="Configuration" id="Configuration"></a> <h3>Configuration</h3> <ul class='doc-sublist'> <h4>Configuration Examples and TechNotes</h4> <li><a href='/c/en/us/support/docs/ip/ip-addressing-services/218383-use-ip-nat-command-for-configuration.html' data-recentlyviewed='stdLink'>Configure IP NAT Outside Source Static Command </a><span class='most_recent_link_date' style='display:none'>20-Sep-2024</span></li> <li><a href='/c/en/us/support/docs/ip/access-lists/26448-ACLsamples.html' data-recentlyviewed='stdLink'>Configure Commonly Used IP ACLs </a><span class='most_recent_link_date' style='display:none'>21-Nov-2023</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/200255-Configure-VRF-Aware-Software-Infrastruct.html' data-recentlyviewed='stdLink'>Configure VRF-Aware Software Infrastructure NAT on Cisco IOS XE </a><span class='most_recent_link_date' style='display:none'>16-Oct-2023</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/113275-nat-ptv6.html' data-recentlyviewed='stdLink'>Static NAT-PT for IPv6 Configuration Example </a><span class='most_recent_link_date' style='display:none'>07-Feb-2020</span></li> <li><a href='/c/en/us/support/docs/routers/sd-wan/215106-service-side-destination-based-network-a.html' data-recentlyviewed='stdLink'>Service Side Destination Based NAT on vEdge Router </a><span class='most_recent_link_date' style='display:none'>11-Dec-2019</span></li> <li><a href='/c/en/us/support/docs/security/ios-network-address-translation-nat/212392-configure-nat-reflection-on-the-asa-for.html' data-recentlyviewed='stdLink'>Configure NAT Reflection On The ASA For The VCS Expressway TelePresence Devices </a><span class='most_recent_link_date' style='display:none'>13-Aug-2018</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/200608-Server-Load-Balancing-Using-Dynamic-NAT.html' data-recentlyviewed='stdLink'>Configure Server Load Balancing Using Dynamic NAT </a><span class='most_recent_link_date' style='display:none'>04-Jun-2018</span></li> <li><a href='/c/en/us/support/docs/security/asa-5500-x-series-firewalls/211275-Configuration-Example-of-ASA-VPN-with-Ov.html' data-recentlyviewed='stdLink'>Configuration Example of ASA VPN with Overlapping Scenarios </a><span class='most_recent_link_date' style='display:none'>23-May-2017</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/118768-config-asr-00.html' data-recentlyviewed='stdLink'>ASR 1000 Box-to-Box NAT High Availability Configuration Example </a><span class='most_recent_link_date' style='display:none'>07-Mar-2017</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/200726-Configure-NAT-to-Enable-Communication-Be.html' data-recentlyviewed='stdLink'>Configure NAT to Enable Communication Between Overlapping Networks </a><span class='most_recent_link_date' style='display:none'>14-Oct-2016</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/119195-configure-asa-00.html' data-recentlyviewed='stdLink'>Configure the ASA for Dual Internal Networks </a><span class='most_recent_link_date' style='display:none'>05-Aug-2015</span></li> <li><a href='/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/72273-dns-doctoring-3zones.html' data-recentlyviewed='stdLink'>Configure DNS Doctoring for Three NAT Interfaces on ASA Release 9.x </a><span class='most_recent_link_date' style='display:none'>27-May-2015</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/118958-configure-asa-00.html' data-recentlyviewed='stdLink'>Configure the ASA for SMTP Mail Server Access in DMZ, Inside, and Outside Networks </a><span class='most_recent_link_date' style='display:none'>13-May-2015</span></li> <li><a href='/c/dam/en/us/support/docs/ip/network-address-translation-nat/6505-NATonStickUpdate.txt' data-recentlyviewed='pdf'>Network Address Translation on a Stick </a><span class='most_recent_link_date' style='display:none'>26-Sep-2014</span> <span class='is-new-link'>(TXT - 0 KB)</span></li> <li><a href='/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/118089-configure-asa-00.html' data-recentlyviewed='stdLink'>ASA Authentication to a Standby ASA When the AAA Device is Located Through a L2L Configuration Example </a><span class='most_recent_link_date' style='display:none'>13-Aug-2014</span></li> </ul> <a href="/c/en/us/tech/ip/ip-addressing-services/tech-configuration-examples-list.html" class="lll-link">View all documentation of this type<span></span> </a> </li> <li><a name="OperationandTroubleshooting" id="OperationandTroubleshooting"></a> <h3>Operation and Troubleshooting</h3> <ul class='doc-sublist'> <h4>Maintain and Operate TechNotes</h4> <li> <h4>Dynamic Address Allocation and Resolution</h4> <ul class='doc-sublist'> <li><a href='/c/en/us/support/docs/ip/simple-network-management-protocol-snmp/13495-clear-arp.html' data-recentlyviewed='stdLink'>How to Clear a Single ARP Entry in a Router Using SNMP </a><span class='most_recent_link_date' style='display:none'>17-Nov-2005</span></li> </ul> </li> </ul> <ul class='doc-sublist'> <h4>Troubleshooting TechNotes</h4> <li><a href='/c/en/us/support/docs/ip/access-lists/13608-21.html' data-recentlyviewed='stdLink'>Harden IOS Devices </a><span class='most_recent_link_date' style='display:none'>12-Sep-2024</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/221481-8605-13.html' data-recentlyviewed='stdLink'>Verify and Troubleshoot Basic NAT Connectivity </a><span class='most_recent_link_date' style='display:none'>10-Sep-2024</span></li> <li><a href='/c/en/us/support/docs/security/anyconnect-secure-mobility-client/215875-configure-anyconnect-vpn-client-on-ftd.html' data-recentlyviewed='stdLink'>Configure AnyConnect VPN Client on FTD: Hairpin and NAT Exemption </a><span class='most_recent_link_date' style='display:none'>02-Aug-2024</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/6209-5.html' data-recentlyviewed='stdLink'>Understand the NAT Order of Operation </a><span class='most_recent_link_date' style='display:none'>15-Mar-2024</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/221448-asr1k-nat-intermittently-fails-to-transl.html' data-recentlyviewed='stdLink'>Troubleshoot IOS-XE NAT Intermittent Failure to Translate some Packets </a><span class='most_recent_link_date' style='display:none'>22-Dec-2023</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/13772-12.html' data-recentlyviewed='stdLink'>Configure Network Address Translation </a><span class='most_recent_link_date' style='display:none'>03-Nov-2023</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/217208-understanding-nat64-and-its-configuratio.html' data-recentlyviewed='stdLink'>Understand and Configure NAT64 </a><span class='most_recent_link_date' style='display:none'>02-Nov-2023</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/221048-configure-and-verify-nat-on-nexus.html' data-recentlyviewed='stdLink'>Configure and Verify NAT on Nexus </a><span class='most_recent_link_date' style='display:none'>05-Oct-2023</span></li> <li><a href='/c/en/us/support/docs/ios-nx-os-software/8021x/116529-problemsolution-product-00.html' data-recentlyviewed='stdLink'>Troubleshoot Duplicate IP Address 0.0.0.0 Error Messages </a><span class='most_recent_link_date' style='display:none'>21-Aug-2023</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/8605-13.html' data-recentlyviewed='stdLink'>Verify and Troubleshoot Basic NAT Operations </a><span class='most_recent_link_date' style='display:none'>14-Aug-2023</span></li> <li><a href='/c/en/us/support/docs/ip/dynamic-address-allocation-resolution/13718-5.html' data-recentlyviewed='stdLink'>Understand Proxy Address Resolution Protocol (ARP) </a><span class='most_recent_link_date' style='display:none'>02-Jun-2023</span></li> <li><a href='/c/en/us/support/docs/ip/dynamic-address-allocation-resolution/13711-40.html' data-recentlyviewed='stdLink'>Configure Subnet Zero and All-Ones Subnet </a><span class='most_recent_link_date' style='display:none'>07-Feb-2023</span></li> <li><a href='/c/en/us/support/docs/ip/access-lists/44541-tacl.html' data-recentlyviewed='stdLink'>Transit Access Control Lists: Filtering at Your Edge </a><span class='most_recent_link_date' style='display:none'>17-Jan-2023</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/4606-8.html' data-recentlyviewed='stdLink'>Use Local and Global NAT Terms </a><span class='most_recent_link_date' style='display:none'>09-Dec-2022</span></li> <li><a href='/c/en/us/support/docs/ip/network-address-translation-nat/217599-understand-nat-to-enable-peer-to-peer-co.html' data-recentlyviewed='stdLink'>Understand NAT to Enable Peer-To-Peer Communication on IOS and IOS XE Routers </a><span class='most_recent_link_date' style='display:none'>07-Dec-2022</span></li> </ul> <a href="/c/en/us/tech/ip/ip-addressing-services/tsd-technology-support-troubleshooting-technotes-list.html" class="lll-link">View all documentation of this type<span></span> </a> </li> </ul> </div> <a name="documentsBottom"></a> </div>  </div> </div> </dd> <dt class="dtname"><button>Community</button></dt> <dd id="info-community" > <div class="communityseries" > <nav class="community-links"> <ul>  <li><a href="https://community.cisco.com/t5/technology-and-support/ct-p/technology-support">Cisco Community Home</a></li>  <li><a href="//supportforums.cisco.com/node/add/discussion" class="start-a-discussion">Ask a Question<img alt="login required" src="/etc/designs/cdc/fw/i/icon_lock_small.png"></a></li> </ul> </nav> <ul aria-expanded="false" class="board_selector"> <li class="initial"> <button value="">Select a Community Board</button> <button value=""><p class="reset">Reset</p></button> </li> </ul> <div id="community-results"> <div class="community-latest" > <h2><button><span >Latest Community Activity For This Technology</span ></button></h2>  </div> <div class="community-solved" > <h2><button><span >Solved Issues</span ></button></h2>  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