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
AS1 LVLT-1 US (United States of America)
AS2 UDEL-DCN US (United States of America)
AS3 MIT-GATEWAYS US (United States of America)
AS4 ISI-AS US (United States of America)
AS5 SYMBOLICS US (United States of America)
AS6 BULL-HN US (United States of America)
AS7 The Defence Science and Technology Laboratory EU
AS8 RICE-AS US (United States of America)
AS9 CMU-ROUTER US (United States of America)
AS10 CSNET-EXT-AS US (United States of America)
AS12 NYU-DOMAIN US (United States of America)
AS13 DNIC-AS-00013 US (United States of America)
AS14 COLUMBIA-GW US (United States of America)
AS16 LBL US (United States of America)
AS17 PURDUE US (United States of America)
AS18 UTEXAS US (United States of America)
AS19 LEIDOS-AS US (United States of America)
AS20 UR US (United States of America)
AS21 RAND US (United States of America)
AS22 DNIC-AS-00022 US (United States of America)
AS24 AS24 US (United States of America)
AS25 UCB US (United States of America)
AS26 CORNELL US (United States of America)
AS27 UMDNET US (United States of America)
AS29 YALE-AS US (United States of America)
AS30 SRI-AICNET US (United States of America)
AS31 CIT US (United States of America)
AS32 STANFORD US (United States of America)
AS33 HPINC US (United States of America)
AS34 UDELNET US (United States of America)
AS35 MITRE-AS-1 US (United States of America)
AS37 DNIC-AS-00037 US (United States of America)
AS38 UIUC US (United States of America)
AS42 WOODYNET-1 US (United States of America)
AS43 BNL-AS US (United States of America)
AS44 S1-DOMAIN US (United States of America)
AS45 LLL-TIS-AS US (United States of America)
AS46 RUTGERS US (United States of America)
AS47 USC-AS US (United States of America)
AS48 DNIC-AS-00048 US (United States of America)
AS49 US-NATIONAL-INSTITUTE-OF-STANDARDS-AND-TECHNOLOGY US (United States of America)
AS50 ORNL-MSRNET US (United States of America)
AS52 UCLA US (United States of America)
AS55 UPENN US (United States of America)
AS56 DNIC-AS-00056 US (United States of America)
AS57 NL-GIGAPOP US (United States of America)
AS59 WISC-MADISON-AS US (United States of America)
AS62 CONE US (United States of America)
AS63 LL-MI US (United States of America)
AS65 AF-RASN-65 US (United States of America)

Pages

Languages