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.
AS4134China TelecomAS4809China Telecom CN2AS23764China Telecom CTGNetAS4837China UnicomAS9929China Unicom CUIIAS9808China MobileAS58453China Mobile Intl (CMI)AS4538CERNETAS7497CAS CSTNETAS37963Alibaba CloudAS45102Alibaba Cloud IntlAS45090Tencent CloudAS132203Tencent Cloud IntlAS55990Huawei CloudAS136907Huawei Cloud IntlAS38365BaiduAS16509Amazon AWSAS14618Amazon AWS
86,509 ASNs in total · Page 1 / 866
| ASN | Name | Country | IP prefixes (v4 / v6) |
|---|---|---|---|
| AS1 | Level 3 Parent, LLC | US | 43 / 0 |
| AS2 | University of Delaware | US | 4 / 0 |
| AS3 | Massachusetts Institute of Technology | US | 31 / 4 |
| AS4 | University of Southern California | US | 15 / 3 |
| AS5 | SYMBOLICS | US | 4 / 0 |
| AS6 | ATOS IT Solutions and Services, Inc. | US | 18 / 1 |
| AS7 | The Defence Science and Technology Laboratory | EU | 10 / 1 |
| AS8 | Rice University | US | 8 / 1 |
| AS9 | Carnegie Mellon University | US | 9 / 2 |
| AS10 | CSNET-EXT-AS | US | 1 / 1 |
| AS12 | New York University | US | 7 / 1 |
| AS13 | Headquarters, USAISC | US | 7 / 1 |
| AS14 | Columbia University | US | 9 / 1 |
| AS16 | Lawrence Berkeley National Laboratory | US | 4 / 3 |
| AS17 | Purdue University | US | 24 / 4 |
| AS18 | University of Texas at Austin | US | 8 / 0 |
| AS19 | Leidos, Inc. | US | 10 / 2 |
| AS20 | University of Rochester | US | 3 / 1 |
| AS21 | The RAND Corporation | US | 9 / 0 |
| AS22 | Navy Network Information Center (NNIC) | US | 6 / 2 |
| AS24 | PT. Arsen Kusuma Indonesia | US | 2 / 2 |
| AS25 | University of California at Berkeley | US | 14 / 5 |
| AS26 | Cornell University | US | 5 / 1 |
| AS27 | University of Maryland | US | 3 / 5 |
| AS29 | Yale University | US | 7 / 1 |
| AS31 | California Institute of Technology | US | 8 / 3 |
| AS32 | Stanford University | US | 4 / 2 |
| AS33 | HP Inc. | US | 6 / 0 |
| AS34 | University of Delaware | US | 2 / 1 |
| AS35 | The MITRE Corporation | US | 8 / 0 |
| AS37 | Navy Network Information Center (NNIC) | US | 5 / 1 |
| AS38 | University of Illinois | US | 7 / 2 |
| AS42 | WoodyNet, Inc. | US | 67 / 59 |
| AS43 | Brookhaven National Laboratory | US | 5 / 3 |
| AS44 | Lawrence Livermore National Laboratory | US | 3 / 0 |
| AS45 | Lawrence Livermore National Laboratory | US | 7 / 1 |
| AS46 | Rutgers, The State University | US | 9 / 1 |
| AS47 | University of Southern California | US | 12 / 0 |
| AS48 | Navy Network Information Center (NNIC) | US | 2 / 1 |
| AS49 | National Institute of Standards and Technology | US | 4 / 4 |
| AS50 | Oak Ridge National Laboratory | US | 8 / 1 |
| AS52 | University of California, Los Angeles | US | 13 / 6 |
| AS55 | University of Pennsylvania | US | 6 / 2 |
| AS56 | United States Department of Defense (DoD) | US | 318 / 0 |
| AS57 | University of Minnesota | US | 4 / 1 |
| AS59 | University of Wisconsin Madison | US | 13 / 1 |
| AS62 | CyrusOne LLC | US | 108 / 9 |
| AS63 | Massachusetts Institute of Technology | US | 4 / 0 |
| AS65 | Air Force Systems Networking | US | 2 / 0 |
| AS68 | Los Alamos National Laboratory | US | 8 / 2 |
| AS69 | University of Pennsylvania | US | 1 / 0 |
| AS70 | National Library of Medicine | US | 22 / 2 |
| AS71 | HP Inc. | US | 8 / 2 |
| AS72 | Schlumberger Limited | US | 67 / 0 |
| AS73 | University of Washington | US | 10 / 2 |
| AS77 | Johns Hopkins University Applied Physics Laboratory | US | 3 / 0 |
| AS78 | BT Americas, Inc | US | 3 / 0 |
| AS80 | GE Vernova | US | 7 / 0 |
| AS81 | MCNC | US | 70 / 8 |
| AS82 | Attachmate Corp. | US | 8 / 3 |
| AS84 | Navy Network Information Center (NNIC) | US | 5 / 1 |
| AS85 | The Aerospace Corporation | US | 7 / 1 |
| AS86 | DXC US Latin America Corporation | US | 1 / 5 |
| AS87 | Indiana University | US | 10 / 2 |
| AS88 | Princeton University | US | 5 / 2 |
| AS89 | Navy Network Information Center (NNIC) | US | 3 / 0 |
| AS91 | Rensselaer Polytechnic Institute | US | 8 / 2 |
| AS92 | Clarkson University | US | 1 / 1 |
| AS93 | NTT America, Inc. | US | 1 / 1 |
| AS97 | NTT America, Inc. | US | 1 / 0 |
| AS98 | The Rockefeller University | US | 1 / 0 |
| AS100 | FMC Central Engineering Laboratories | US | 5 / 0 |
| AS101 | University of Washington | US | 3 / 2 |
| AS102 | U.S. National Science Foundation | US | 3 / 1 |
| AS103 | Northwestern University | US | 14 / 1 |
| AS104 | University of Colorado at Boulder | US | 13 / 2 |
| AS106 | General Dynamics Mission Systems, Inc. | US | 5 / 0 |
| AS109 | CISCO SYSTEMS, INC. | US | 30 / 10 |
| AS111 | Boston University | US | 8 / 1 |
| AS112 | DNS-OARC | US | 2 / 2 |
| AS116 | Ericsson Inc. | US | 7 / 0 |
| AS121 | United States Department of Defense (DoD) | US | 2 / 0 |
| AS122 | UPMC | US | 13 / 1 |
| AS125 | Honeywell International, Inc. | US | 20 / 0 |
| AS126 | United States Department of Defense (DoD) | US | 1 / 0 |
| AS127 | Jet Propulsion Laboratory | US | 14 / 2 |
| AS129 | United States Department of Defense (DoD) | US | 9 / 0 |
| AS131 | University of California, Santa Barbara | US | 7 / 3 |
| AS137 | Consortium GARR | IT | 62 / 2 |
| AS138 | United States Department of Defense (DoD) | US | 49 / 0 |
| AS149 | United States Department of Defense (DoD) | US | 10 / 0 |
| AS153 | Headquarters, USAISC | US | 1 / 0 |
| AS155 | United States Department of Defense (DoD) | US | 2 / 0 |
| AS156 | Northeastern University | US | 5 / 0 |
| AS157 | HEWLETT PACKARD ENTERPRISE COMPANY | US | 1 / 0 |
| AS158 | Ericsson Inc. | US | 61 / 11 |
| AS159 | Ohio State University | US | 7 / 1 |
| AS160 | The University of Chicago | US | 5 / 2 |
| AS161 | Texas Instruments Incorporated | US | 6 / 0 |
| AS166 | Institute for Defense Analyses | US | 10 / 0 |