CINXE.COM
Robtex
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} * { box-sizing: border-box; } table.dnsh { background: #eee; } td.dnsht { background: #0c0; } td.dnshf { background: #ccc; } html,body { margin: 0px; padding: 0px; width: 100%; background: #fff; } .rtad { visibility: hidden; } body { font-family: "Trebuchet MS", Arial, Helvetica, sans-serif; font-size: 18pt; line-height: 1.5; text-rendering: optimizeLegibility; width: 100%; } #contres { } #mynetwork { height: 100%; } #mynetworkflex { display: flex; width: 100%; height: 100%; } #mynetworkcanvas { height: 100%; flex-grow: 1; flex: 1; } .rtfrag { } .rtfragmax { height: 100%; } .rtgui { display: flex; flex-direction: column; flex-wrap: wrap; } .rtfragui { border: 3px solid #63bb9d; width: 100%; margin: 1em 0; } .rtfragh { background: #63bb9d; margin: none; padding: 1px; display: flex; flex-direction: row; } .rtfragh > div { } .rtfragh > div:nth-child(1) { flex: 1; } .rtfragh > div:nth-child(2) { } .rtfragh > div:nth-child(2) > span > a { border-bottom: none; } .rtfragh > div > div { } .rtfragh> div > h2 { background: #63bb9d; 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flex-flow: row wrap; width: 100%; display: flex; qborder: 3px solid #000; } .autofold2 div { flex: 1; background: #fff; display: flex; jborder: 1px solid #800; } .autofold2 div { padding: 1px; border: 1px solid #000; border-radius: 5px } prog#div { z-order: 1000; } .scrollist > li { list-style: none; max-width: 200px; min-width: 100px; white-space: nowrap; } .scrollist { } .scrollist::-webkit-scrollbar { -webkit-appearance: none; height: 10px; } .scrollist::-webkit-scrollbar-thumb { background-color: rgba(0,0,0,.5); } .scrollist::-webkit-scrollbar { background-color: rgb(99, 187, 157); border: none; } .rtstyle h2, .rtstyle h3 { text-align: center; background: #eee; border-bottom: 1px solid #ccc; } @media screen and (max-width: 499px) { #mynetworkdragl, #mynetworkdragr { width: 30px; background: url( data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAICAYAAAA4GpVBAAAAGUlEQVQYV2O4e/fuf4bdu3cjEzNnzkQXAwADDhmBxLFwEwAAAABJRU5ErkJggg== ) repeat; } .scrollist { columns: 200px; overflow-x: auto; max-height: 100px; } } .notfound:after { display:block; content:'Nothing found here, sorry'; color:#008 } .pleaselogin:after { display:block; content:'Please login to see this section'; color:#008; } .loading:after { display:block; content:'loading...'; color:#008; } @media screen and (min-width: 500px) { body { font-size:11pt; } .rtstyle { } .scrollist { clear: none; font-family: verdana,arial,sans-serif; max-width: 100%; overflow-x: hidden; padding: 2px; overflow-y: auto; max-height: 600px; margin: 0; border-bottom: 2px solid #ccc; border-top: 2px solid #ccc; } .rtstyle h2, .rtstyle h3 { text-align: left; padding-left: 20px; } .infobox { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-start; } .infobox > div { border: #63bb9d solid 1px; margin: 5px; flex-grow: 1; flex-shrink: 1; box-shadow: 7px 7px 10px 0px #ddd; border-radius: 4px; } } .infobox h3 { border: 0; margin: 0; background: #63bb9d; } .img24 { width: 24px; height: 24px; } .img_restore { background-image: url("data:image/svg+xml,%3Csvg fill='%23000000' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'%3E %3Cpath d='M0 0h24v24H0z' fill='none'/%3E %3Cpath d='M5 16h3v3h2v-5H5v2zm3-8H5v2h5V5H8v3zm6 11h2v-3h3v-2h-5v5zm2-11V5h-2v5h5V8h-3z'/%3E %3C/svg%3E"); } .img_fullscreen { background-image: url("data:image/svg+xml, %3Csvg fill='%23000000' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'%3E %3Cpath d='M0 0h24v24H0z' fill='none'/%3E %3Cpath d='M7 14H5v5h5v-2H7v-3zm-2-4h2V7h3V5H5v5zm12 7h-3v2h5v-5h-2v3zM14 5v2h3v3h2V5h-5z'/%3E %3C/svg%3E"); } .img_bottom { background-image: url("data:image/svg+xml, %3Csvg fill='%23000000' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'%3E %3Cpath d='M16 13h-3V3h-2v10H8l4 4 4-4zM4 19v2h16v-2H4z'/%3E %3Cpath d='M0 0h24v24H0z' fill='none'/%3E %3C/svg%3E"); } .im_top { background-image: url("data:image/svg+xml, %3Csvg fill='%23000000' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'%3E %3Cpath d='M8 11h3v10h2V11h3l-4-4-4 4zM4 3v2h16V3H4z'/%3E %3Cpath d='M0 0h24v24H0z' fill='none'/%3E %3C/svg%3E"); } .rtpopup table td { border: 1px; } .rtpopup table td a { text-decoration: none; } .rtpopup table td strike { color: #f00; } .rtpopup table td b { text-decoration: none; } .ttal , .rtpopup table td.shared1 { text-align: left; background: linear-gradient(30deg, #ccf 10%,#fff 90%); } .ttar, .rtpopup table td.shared2 { text-align: right; background: linear-gradient(30deg, #fff 10%,#cfc 90%); } .rtpopup table td.shared3 { text-align: center; background: linear-gradient(90deg, #ccc 10%,#ccc 90%); } .rtpopup table tr.l0 { background: #fcc; } .rtpopup table tr.l1 { background: #eec; } .rtpopup { min-width: 100px; min-height: 100px; background: #fff; box-shadow: 10px 10px 10px 0 rgba(0,0,0,0.1); border-radius: 5px; border: 4px solid #ccc; padding: 4px; max-height: 500px; overflow: scroll; z-index: 1111; } .rtpopup::-webkit-scrollbar { -webkit-appearance: none; height: 10px; } .rtpopup::-webkit-scrollbar-thumb { background-color: rgba(0,0,0,.5); } .rtpopup h1 { margin: 0px; font-size: 14px; } .flex1 { display: flex; flex-wrap: wrap; } .flex1 > div { flex: 1; } .seo table { border: 1px solid black; min-width: 300px; border-radius: 3px; margin: 3px; } .endsection { font-style: italic; font-weight: lighter; clear: both; text-align: right; } .xsha { display: flex; flex-wrap: wrap; } .xsha > div { page-break-inside: avoid; -webkit-column-break-inside: avoid; padding: 5px 10px 10px 5px; } .xsha>div>div { background: #63bb9d; color: #1f701f; min-height: 50px; } .xsha > div > div > span { padding: 10px; } .xsha h3 { color: #ffffff; margin: 0px; padding: 7px; background: #63bb9d; border: none; } .xbul { border: 1px solid #000000; clear: none; font-family: verdana,arial,sans-serif; max-height: 300px; margin: 0; overflow-x: auto; padding: 2px; max-width: 100%; padding: 9px; } .xbul li { list-style-type: none; margin-left: 0px; display: list-item; } .xsha>div { page-break-inside: avoid; -webkit-column-break-inside: avoid; padding: 5px 10px 10px 5px; } .old h3 { background: none; border: none; } @media (max-width: 767px) { .xbul { max-height: 140px; columns: 300px; } } @media (max-width: 767px) { .xsha>div { width: 100%; } } @media (min-width: 768px) { .xsha>div { width: 300px; } } .anchor { content: 'ANCHOR'; position: relative; top: -100px; display: inline; } div.rttab ul { display: flex; flex-wrap: wrap; } div.rttab button, div.rttab li { color: #1f701f; font-family: arial; padding: 3px; flex: 1; word-break: normal; margin: 2px; text-align: center; border: 2px solid #1f701f; border-radius: 3px; background: #fff; color: #000; text-decoration: none; font-size: 10px; } div.rttab a { text-decoration: none; } div.rttab ul { list-style-type: none; margin: 0; padding: 0; } div.rttab li { } span.censor { background: #888; } span.censor:hover { background: none; } span.censor:hover:before { background: #f0f; content: attr(data-hover); position: absolute; overflow: visible; z-index: 2000; } span.censor:hover:before { background: #ff0; } table.protable { border-radius: 0; border-collapse: collapse; width: 100%; } table.protable tr { } table.protable td { padding: 10px; } table.protable tr:nth-child(even) td { background: #eef; } table.protable tr:nth-child(odd) td { background: #efe; } table.protable th { background: #ccc; } table.table2col { border-radius: 0; width: 500px; border: 1px solid #ccc; border-collapse:collapse; margin:0 30px; } table.table2col tr { width: 400px; } table.table2col td , table.table2col th { padding:4px 7px; } table.table2col tr.ttog0 td { background: #eef; } table.table2col tr.ttog0 th { background: #ccf; } table.table2col tr.ttog1 td { background: #efe; } table.table2col tr.ttog1 th[scope=row] { background: #cfc; } table.table2col th:not([scope=row]) { background:#ccc; } table.table2col th[scope=row] { vertical-align: top; text-align:left; width:140px; } table.table2col td { background:#f0f; } table.table2col ul { padding:0; margin:0; } table.table2col li { list-style: none; white-space: nowrap; } .button { background: #f8f8f8; border-radius: 3px; padding: 3px; } div.loginbar { background: #ccc; font-size: 10px; display: flex; justify-content: flex-end; } div.loginbar > div { flex: 1; flex-grow: 0; white-space: nowrap; } div.loginbar .button { border: none; cursor: pointer; margin: 0 5px; } div.loginbar .button a { text-decoration: none; } .img24 { width: 24px; height: 24px; display: inline-block; border: none; background: none; } .img_restore { background-image: url("data:image/svg+xml,%3Csvg fill='%23000000' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'%3E %3Cpath d='M0 0h24v24H0z' fill='none'/%3E %3Cpath d='M5 16h3v3h2v-5H5v2zm3-8H5v2h5V5H8v3zm6 11h2v-3h3v-2h-5v5zm2-11V5h-2v5h5V8h-3z'/%3E %3C/svg%3E"); } .img_fullscreen { background-image: url("data:image/svg+xml, %3Csvg fill='%23000000' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'%3E %3Cpath d='M0 0h24v24H0z' fill='none'/%3E %3Cpath d='M7 14H5v5h5v-2H7v-3zm-2-4h2V7h3V5H5v5zm12 7h-3v2h5v-5h-2v3zM14 5v2h3v3h2V5h-5z'/%3E %3C/svg%3E"); } .img_bottom { background-image: url("data:image/svg+xml, %3Csvg fill='%23000000' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'%3E %3Cpath d='M16 13h-3V3h-2v10H8l4 4 4-4zM4 19v2h16v-2H4z'/%3E %3Cpath d='M0 0h24v24H0z' fill='none'/%3E %3C/svg%3E"); } .img_top { background-image: url("data:image/svg+xml, %3Csvg fill='%23000000' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'%3E %3Cpath d='M8 11h3v10h2V11h3l-4-4-4 4zM4 3v2h16V3H4z'/%3E %3Cpath d='M0 0h24v24H0z' fill='none'/%3E %3C/svg%3E"); } #rtfragc_visgraph { height: 500px; } #rtfragc_dnst, #rtfragc_dnsbl, #rtfragc_ohistory, #rtfragc_owhois { height: 300px; } #rtfragc_ograph { overflow: scroll; } @keyframes spin { to { transform: rotate(1turn); } } .aspan { display: inline; background: #f0f; } .dlicon { display: inline-block; width: 20px; clear: none; } .progress { position: relative; display: inline-block; width: 5em; height: 5em; margin: 0 .5em; font-size: 12px; text-indent: 999em; overflow: hidden; animation: spin 1s infinite steps(8); } .small.progress { font-size: 4px; } .large.progress { font-size: 24px; } .progress:before, .progress:after, .progress > div:before, .progress > div:after { content: ''; position: absolute; top: 0; left: 2.25em; width: .5em; 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</script> </div> <div id="superdiv"> <p class="c0"><span>Per definition, an Autonomous System (AS) is a network (or entity) sharing the same rules on how it should connect to the rest of the internet (routing policy). As such, it functions as one independent sub-section of the internet. This is done to make internet routing more comprehensible. Each AS is assigned a specific number (ASN) that can be used in BGP (Border Gateway Protocol) routing, defining paths for traffic to follow. In most cases, holders of ASN have multiple uplinks where traffic can be diverted in case of a failure. As such, no single point of failure can bring down the entity. Just like with IP-networks, one big ASN can have several smaller ones behind it. This makes global routing scalable, as other networks only have to keep track of the larger ASN, functioning as a front for the rest. Not all connections are public, as some have private peering (exchange of data between two or more ASN), that is not visible in the public route-view servers. This is an exception that may warrant having an ASN, even though you are not multihomed (and thus most likely share the general routing policy of your uplink).</span></p> <p class="c5 c0"></p> <p class="c0 c5"></p> <p class="c0"><span>In short, BGP is the communication tool used to relay information between different networks or groups of networks (defined by ASN). These different sections are assigned IP-networks (or</span> <span class="c2">prefixes</span><span>) in the routing table. As such, BGP can be used to define what routes traffic should go through, and under what circumstances (following a list of set rules, or</span> <span class= "c2">attributes</span><span>)</span><span>. In essence, BGP defines reachability/preferred paths across different networks or groups of networks. Exchanging routing information between internet service providers (ISPs) is essential for maintaining global traffic paths. In some really large networks, BGP can be used internally within the same AS. However, it is most commonly used externally between different AS.</span></p> <p class="c5 c0"></p> <p class="c0"><span>Each router will have a routing table, listing prefixes of all its neighbors (or</span> <span class= "c2">peers</span><span>)</span><span>. This makes it possible for routers to know what path to follow. Since the introduction of BGP4, efforts are made to decrease the size of routing tables. The primary solution implemented since version 4, is classless inter-domain routing (CIDR), explained in the <a href="/route/">applicable section</a>. Note that the routers within each ASN in the scheme below, may still communicate using IBGP, which is used solely for internal communication. BGP is primarily used between edge routers (the front routers of each network, defined by ASN).</span></p> <tt> <p class="c0"><span> |--------------------|</span></p> <p class="c0"> <span>|-----------------|   |---------------------------------| ← IBGP → | internal router A |</span></p> <p class="c0"><span>| AS 1 | ← BGP 4 → | edge router of AS 2 | |--------------------|</span></p> <p class="c0"><span>|-----------------| |---------------------------------| ← IBGP → |-------------------|</span></p> <p class="c0"><span> | internal router B |</span></p> <p class="c0"><span> |-------------------|</span></p> </tt> <p class="c5 c0"></p> <p class="c0"><span>By entering an ASN above, you will get detailed information on the connectivity of said autonomous system, where you will be able to follow traffic routes through different sections of the internet and you will be presented with a list of prefixes originating from that AS-number.</span></p> <br/></div> <div style="clear:both"></div> </div> </article> <div id='zsocial'> </div> </main> <div class="soctop"> <div id="divaddthis" class="addthis_inline_share_toolbox"></div> <div><a class="twitter-follow-button" href="https://twitter.com/robtexdotcom" data-show-screen-name="false" data-show-count="true" data-size="large"> Follow</a></div> </div> <footer> <ul> <li> <div>Robtex</div> <ul> <li><a class="rtgo" href="https://twitter.com/robtexdotcom">Twitter</a></li> <li><a class="rtgo" href="https://www.facebook.com/robtexdotcom">Facebook</a></li> <li><a class="rtgo" href="https://plus.google.com/+robtex">Google+</a></li> <li><a class="rtgo" href="https://www.linkedin.com/company/robtex">LinkedIn</a></li> </ul> </li> <li> <div>About</div> <ul> <li><a href="/">Home</a></li> <li><a href="/privacy-policy">Privacy Policy</a></li> <li><a href="/api/">API</a></li> <li><a href="/stats/">Statistics</a></li> </ul> </li> <li> <div>Sections</div> <ul> <li><a href="/dns-lookup/">DNS</a></li> <li><a href="/ip-lookup/">IP</a></li> <li><a href="/as/">AS Numbers</a></li> <li><a href="/asmacro/">AS Macros</a></li> <li><a href="/cidr/">Network Routes</a></li> <li><a href="/premium/">Premium Reports</a></li> </ul> </li> </ul> 漏 2020 Robtex <hr/> <span id="statusgif"></span> <script> //loadflags|=2; //doit(); </script> <div style=""></div> </footer> <div id="sse2"></div> <script> checkcookies(); </script> This site is protected by reCAPTCHA and the Google <a href="https://policies.google.com/privacy">Privacy Policy</a> and <a href="https://policies.google.com/terms">Terms of Service</a> apply. <style> .grecaptcha-badge { display: none; } </style> <script type="text/javascript"> var onloadCallback = function() { grecaptcha.ready(function() { grecaptcha.execute('6LcNupIUAAAAAKqpkrqfj8RXxPKYuJJ7QNnfUzoA', {action: 'hit'}) .then(function(token) { var elem = document.createElement('script'); elem.src = '/rtx/recaptcha/'+token; elem.async = true; elem.type = "text/javascript"; document.head.appendChild(elem); console.log(token); }); }); }; </script> <script src="https://www.google.com/recaptcha/api.js?onload=onloadCallback&render=6LcNupIUAAAAAKqpkrqfj8RXxPKYuJJ7QNnfUzoA" async></script> </body> </html>