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
AS65 AF-RASN-65 US (United States)
AS68 LANL-INET-AS US (United States)
AS70 NLM-GW US (United States)
AS71 HP-INTERNET-AS US (United States)
AS72 SCHLUMBERGER-AS US (United States)
AS73 WASHINGTON-AS US (United States)
AS74 SSC-299-Z-74 CA (Canada)
AS77 JHUAPL-AS US (United States)
AS78 BA-346-78 US (United States)
AS81 NCREN US (United States)
AS83 DNIC-AS-00083 US (United States)
AS84 DNIC-AS-00084 US (United States)
AS85 AERO-NET US (United States)
AS87 INDIANA-AS US (United States)
AS88 PRINCETON-AS US (United States)
AS89 DNIC-AS-00089 US (United States)
AS91 RPI-AS US (United States)
AS92 CLARKSON-AS US (United States)
AS93 NTTA-93 US (United States)
AS97 NTTA-97 US (United States)
AS98 ROCKEFELLER-AS US (United States)
AS100 FMC-CTC US (United States)
AS101 WASH-NSF-AS US (United States)
AS102 NSF-HQ-AS US (United States)
AS103 NWU-AS US (United States)
AS104 COLORADO-AS US (United States)
AS106 GDAIS-ASN-106 US (United States)
AS109 CISCOSYSTEMS US (United States)
AS111 BOSTONU-AS US (United States)
AS116 TELCORDIA US (United States)
AS118 DNIC-AS-00118 US (United States)
AS121 DNIC-AS-00121 US (United States)
AS122 UPMC-AS122 US (United States)
AS125 HI-NET-AS US (United States)
AS127 JPL-AS127 US (United States)
AS131 UCSB-NET-AS US (United States)
AS132 WPAFB-CSD-NET-AS US (United States)
AS137 Consortium GARR IT (Italy)
AS138 DNIC-AS-00138 US (United States)
AS140 DNIC-AS-00140 US (United States)
AS147 DNIC-AS-00147 US (United States)
AS149 DNIC-AS-00149 US (United States)
AS153 CTNOSC-ASN-153 US (United States)
AS156 NORTHEASTERN-GW-AS US (United States)
AS157 INTELLIAUTON US (United States)
AS158 ERI-AS US (United States)
AS159 OSUNET-AS US (United States)
AS160 U-CHICAGO-AS US (United States)
AS161 TI-AS US (United States)
AS166 IDA-AS US (United States)

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