Autonomous System Number List

An autonomous system (AS) is a collection of connected Internet Protocol (IP) routing prefixes under the control of one or more network operators on behalf of a single administrative entity or domain, that presents a common and clearly defined routing policy to the Internet. Each AS is assigned a unique autonomous system number (ASN), for use in Border Gateway Protocol (BGP) routing.

AS numbers are assigned to Local Internet Registries (LIRs) and end user organizations by their respective Regional Internet Registries (RIRs), which in turn receive blocks of ASNs for reassignment from the Internet Assigned Numbers Authority (IANA). The IANA also maintains a registry of ASNs which are reserved for private use (and should therefore not be announced to the global Internet). The allocated AS numbers are defined as 16-bit and 32-bit integers. The length range of 16-bit is between 0 and 65535, and the length range of 32-bit is between 0 and 4294967294. At present, the 16-bit integers which allowed for a maximum of 65,536 assignments is mostly used.

AS Number AS Organization Country Code
AS1208 DNIC-AS-01208 US (United States)
AS1213 HEAnet IE (Ireland)
AS1215 ORACLE-NA-AS US (United States)
AS1216 ORACLE-EUROPE-AS US (United States)
AS1217 ORACLE-PACRIM-AS US (United States)
AS1218 NCUBE-BELMONT-AS US (United States)
AS1219 NCUBE-OREGON-AS US (United States)
AS1221 Telstra Corporation Ltd AU (Australia)
AS1222 EPCC-AS US (United States)
AS1224 NCSA-AS US (United States)
AS1225 NTTA-1225 US (United States)
AS1226 CTA-42-AS1226 US (United States)
AS1234 Fortum EU
AS1236 GDIT-AS2 US (United States)
AS1237 KISTI KR (Korea, Republic of)
AS1239 SPRINTLINK US (United States)
AS1241 Forthnet EU
AS1246 TLL-WEST US (United States)
AS1248 HERE Global BV NL (Netherlands)
AS1249 FIVE-COLLEGES-AS US (United States)
AS1251 FUNDACAO DE AMPARO A PESQUISA DO ESTADO SAO PAULO BR (Brazil)
AS1252 UNMC-AS US (United States)
AS1256 MASSNET-AS US (United States)
AS1257 Tele2 SWIPnet EU
AS1258 XKL-NET-AS US (United States)
AS1261 NATINST-AS-AS US (United States)
AS1265 SAINT-MARYS-AS US (United States)
AS1267 Wind Tre S.p.A. IT (Italy)
AS1270 UUNET Germany EU
AS1271 Deutsche Telekom Technik GmbH T-CNF EU
AS1273 CW Vodafone Group PLC EU
AS1277 VXCHNGE-AS US (United States)
AS1280 ISC-AS-1280 US (United States)
AS1286 IVAS01 US (United States)
AS1287 PROFESSIONAL-EDUCATION-INSTITUTE US (United States)
AS1289 COLGATE-UNIVERSITY US (United States)
AS1290 Telstra Europe Ltd EU
AS1293 HPES US (United States)
AS1294 NTTDATA-SERVICES-AS1 US (United States)
AS1299 Telia Company AB SE (Sweden)
AS1301 Electricite de France Service National EU
AS1303 Renater EU
AS1307 Renater EU
AS1311 BARRA-NET-AS US (United States)
AS1312 VA-TECH-AS US (United States)
AS1313 ADOBE1-AS-AS US (United States)
AS1315 IPFS US (United States)
AS1321 ANSBB-ASNNET-1 US (United States)
AS1323 ANSBB-ASNNET-1 US (United States)
AS1325 ANSBB-ASNNET-1 US (United States)

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