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
AS292 ESNET-WEST US (United States)
AS293 ESNET US (United States)
AS297 AS297 US (United States)
AS299 UCINET-AS US (United States)
AS300 DNIC-AS-00300 US (United States)
AS302 BCM-INFO-NET-AS US (United States)
AS306 DNIC-ASBLK-00306-00371 US (United States)
AS307 DNIC-ASBLK-00306-00371 US (United States)
AS308 DNIC-ASBLK-00306-00371 US (United States)
AS309 DNIC-ASBLK-00306-00371 US (United States)
AS310 DNIC-ASBLK-00306-00371 US (United States)
AS311 DNIC-ASBLK-00306-00371 US (United States)
AS312 DNIC-ASBLK-00306-00371 US (United States)
AS313 DNIC-ASBLK-00306-00371 US (United States)
AS316 DNIC-ASBLK-00306-00371 US (United States)
AS317 DNIC-ASBLK-00306-00371 US (United States)
AS319 DNIC-ASBLK-00306-00371 US (United States)
AS320 DNIC-ASBLK-00306-00371 US (United States)
AS321 DNIC-ASBLK-00306-00371 US (United States)
AS322 DNIC-ASBLK-00306-00371 US (United States)
AS323 DNIC-ASBLK-00306-00371 US (United States)
AS324 DNIC-ASBLK-00306-00371 US (United States)
AS325 DNIC-ASBLK-00306-00371 US (United States)
AS326 DNIC-ASBLK-00306-00371 US (United States)
AS327 DNIC-ASBLK-00306-00371 US (United States)
AS328 DNIC-ASBLK-00306-00371 US (United States)
AS329 DNIC-ASBLK-00306-00371 US (United States)
AS331 DNIC-ASBLK-00306-00371 US (United States)
AS334 DNIC-ASBLK-00306-00371 US (United States)
AS335 DNIC-ASBLK-00306-00371 US (United States)
AS336 DNIC-ASBLK-00306-00371 US (United States)
AS337 DNIC-ASBLK-00306-00371 US (United States)
AS338 DNIC-ASBLK-00306-00371 US (United States)
AS339 DNIC-ASBLK-00306-00371 US (United States)
AS340 DNIC-ASBLK-00306-00371 US (United States)
AS341 DNIC-ASBLK-00306-00371 US (United States)
AS342 DNIC-ASBLK-00306-00371 US (United States)
AS343 DNIC-ASBLK-00306-00371 US (United States)
AS344 DNIC-ASBLK-00306-00371 US (United States)
AS345 DNIC-ASBLK-00306-00371 US (United States)
AS346 DNIC-ASBLK-00306-00371 US (United States)
AS347 DNIC-ASBLK-00306-00371 US (United States)
AS348 DNIC-ASBLK-00306-00371 US (United States)
AS349 DNIC-ASBLK-00306-00371 US (United States)
AS350 DNIC-ASBLK-00306-00371 US (United States)
AS351 DNIC-ASBLK-00306-00371 US (United States)
AS352 DNIC-ASBLK-00306-00371 US (United States)
AS353 DNIC-ASBLK-00306-00371 US (United States)
AS355 DNIC-ASBLK-00306-00371 US (United States)
AS356 DNIC-ASBLK-00306-00371 US (United States)

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