ASN List
Directory of all announced autonomous systems (AS), aggregated from a local IP→ASN prefix database and refreshed every 12 hours. Click any ASN to view its announced IP prefixes and upstream / downstream / peer topology.
86,509 ASNs in total · Page 2 / 866
| ASN | Name | Country | IP prefixes (v4 / v6) |
|---|---|---|---|
| AS167 | Wesleyan University | US | 2 / 0 |
| AS168 | University of Massachusetts - AMHERST | US | 0 / 1 |
| AS173 | Nippon Telegraph and Telephone Corporation | JP | 2 / 0 |
| AS174 | Cogent Communications, LLC | US | 5,334 / 255 |
| AS177 | University of Michigan | US | 0 / 2 |
| AS186 | The Catholic University of America | US | 2 / 0 |
| AS187 | DNScast | US | 2 / 2 |
| AS188 | SAIC | US | 3 / 0 |
| AS190 | Navy Network Information Center (NNIC) | US | 5 / 0 |
| AS194 | University Corporation for Atmospheric Research | US | 5 / 2 |
| AS195 | San Diego Supercomputer Center | US | 98 / 7 |
| AS196 | The Boeing Company | US | 5 / 0 |
| AS202 | Level 3 Parent, LLC | US | 1 / 0 |
| AS203 | Level 3 Parent, LLC | US | 68 / 0 |
| AS205 | Montclair State University | US | 2 / 0 |
| AS206 | DXC US Latin America Corporation | US | 4 / 0 |
| AS209 | CenturyLink Communications, LLC | US | 1,843 / 24 |
| AS210 | Utah Education Network | US | 21 / 1 |
| AS213 | Headquarters, USAISC | US | 1 / 1 |
| AS217 | University of Minnesota | US | 5 / 1 |
| AS223 | Parsons Corporation | US | 4 / 0 |
| AS224 | Sikt - Kunnskapssektorens Tjenesteleverandor | NO | 16 / 2 |
| AS225 | University of Virginia | US | 15 / 0 |
| AS226 | Los Nettos | US | 36 / 5 |
| AS228 | United States Department of Defense (DoD) | US | 3 / 1 |
| AS229 | Merit Network Inc. | US | 2 / 1 |
| AS231 | Michigan State University | US | 7 / 4 |
| AS237 | Merit Network Inc. | US | 53 / 10 |
| AS239 | University of Toronto | CA | 8 / 3 |
| AS243 | L3Harris Technologies, Inc. | US | 86 / 0 |
| AS249 | European Network | EU | 1 / 2 |
| AS250 | AS250.net Foundation | EU | 4 / 1 |
| AS252 | Headquarters, USAISC | US | 4 / 1 |
| AS254 | Attachmate Corp. | US | 7 / 1 |
| AS257 | Navy Network Information Center (NNIC) | US | 7 / 5 |
| AS258 | Headquarters, USAISC | US | 2 / 0 |
| AS260 | GTT Americas, LLC | US | 5 / 2 |
| AS262 | NTT America, Inc. | US | 0 / 1 |
| AS264 | SRI International | US | 22 / 0 |
| AS267 | Nether.Net | US | 3 / 1 |
| AS268 | Uniformed Services University of the Health Sciences | US | 1 / 0 |
| AS270 | National Aeronautics and Space Administration | US | 79 / 0 |
| AS271 | BCNET | CA | 62 / 34 |
| AS273 | United States Department of Defense (DoD) | US | 2 / 0 |
| AS275 | NTT America, Inc. | US | 1 / 1 |
| AS276 | University of Texas System | US | 1 / 0 |
| AS277 | DXC US Latin America Corporation | US | 3 / 0 |
| AS278 | Universidad Nacional Autonoma de Mexico | MX | 157 / 25 |
| AS283 | MPower Labs, Inc. | US | 1 / 0 |
| AS288 | European Space Agency (ESA) | DE | 32 / 0 |
| AS289 | Headquarters, USAISC | US | 2 / 1 |
| AS291 | ESnet | US | 1 / 0 |
| AS292 | ESnet | US | 1 / 0 |
| AS293 | ESnet | US | 15 / 2 |
| AS297 | National Aeronautics and Space Administration | US | 27 / 6 |
| AS299 | University of California, Irvine | US | 7 / 3 |
| AS300 | United States Department of Defense (DoD) | US | 26 / 1 |
| AS302 | Baylor College of Medicine | US | 9 / 2 |
| AS306 | United States Department of Defense (DoD) | US | 146 / 46 |
| AS316 | United States Department of Defense (DoD) | US | 4 / 1 |
| AS317 | United States Department of Defense (DoD) | US | 7 / 1 |
| AS319 | United States Department of Defense (DoD) | US | 5 / 1 |
| AS320 | United States Department of Defense (DoD) | US | 3 / 1 |
| AS321 | United States Department of Defense (DoD) | US | 8 / 1 |
| AS322 | United States Department of Defense (DoD) | US | 2 / 1 |
| AS323 | United States Department of Defense (DoD) | US | 2 / 1 |
| AS324 | United States Department of Defense (DoD) | US | 2 / 2 |
| AS325 | United States Department of Defense (DoD) | US | 23 / 2 |
| AS326 | United States Department of Defense (DoD) | US | 24 / 0 |
| AS327 | United States Department of Defense (DoD) | US | 3 / 1 |
| AS328 | United States Department of Defense (DoD) | US | 1 / 0 |
| AS329 | United States Department of Defense (DoD) | US | 6 / 1 |
| AS331 | United States Department of Defense (DoD) | US | 5 / 1 |
| AS334 | United States Department of Defense (DoD) | US | 15 / 1 |
| AS335 | United States Department of Defense (DoD) | US | 95 / 1 |
| AS336 | United States Department of Defense (DoD) | US | 8 / 1 |
| AS337 | United States Department of Defense (DoD) | US | 13 / 1 |
| AS338 | United States Department of Defense (DoD) | US | 4 / 1 |
| AS339 | United States Department of Defense (DoD) | US | 4 / 1 |
| AS340 | United States Department of Defense (DoD) | US | 7 / 1 |
| AS341 | United States Department of Defense (DoD) | US | 4 / 1 |
| AS342 | United States Department of Defense (DoD) | US | 7 / 1 |
| AS343 | United States Department of Defense (DoD) | US | 2 / 1 |
| AS344 | United States Department of Defense (DoD) | US | 24 / 1 |
| AS345 | United States Department of Defense (DoD) | US | 9 / 1 |
| AS346 | United States Department of Defense (DoD) | US | 9 / 1 |
| AS347 | United States Department of Defense (DoD) | US | 5 / 1 |
| AS348 | United States Department of Defense (DoD) | US | 3 / 1 |
| AS349 | United States Department of Defense (DoD) | US | 10 / 1 |
| AS350 | United States Department of Defense (DoD) | US | 2 / 1 |
| AS351 | United States Department of Defense (DoD) | US | 2 / 3 |
| AS352 | United States Department of Defense (DoD) | US | 2 / 1 |
| AS353 | United States Department of Defense (DoD) | US | 1 / 0 |
| AS354 | United States Department of Defense (DoD) | US | 0 / 2 |
| AS355 | United States Department of Defense (DoD) | US | 1 / 1 |
| AS356 | United States Department of Defense (DoD) | US | 23 / 0 |
| AS357 | United States Department of Defense (DoD) | US | 4 / 0 |
| AS358 | United States Department of Defense (DoD) | US | 1 / 2 |
| AS359 | United States Department of Defense (DoD) | US | 1 / 1 |
| AS360 | United States Department of Defense (DoD) | US | 24 / 1 |