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
AS400781 XTC-NA-ASN-01 US (United States)
AS400786 PFS US (United States)
AS400792 ANKR US (United States)
AS400799 PUFFERFISH-STUDIOS US (United States)
AS400807 BMU-GW-01 US (United States)
AS400810 BREEZETECH US (United States)
AS400815 CSSBF-01 CA (Canada)
AS400818 AUSRA-SYSTEMS US (United States)
AS400830 BAYFIELD-WIRELESS-00 US (United States)
AS400837 AS400837 US (United States)
AS401306 IR US (United States)
AS401307 MISEN-ASN-1 US (United States)