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
AS615 DNIC-AS-00615 US (United States)
AS616 DNIC-ASBLK-00616-00665 US (United States)
AS619 DNIC-ASBLK-00616-00665 US (United States)
AS627 DNIC-ASBLK-00616-00665 US (United States)
AS634 DNIC-ASBLK-00616-00665 US (United States)
AS636 DNIC-ASBLK-00616-00665 US (United States)
AS637 DNIC-ASBLK-00616-00665 US (United States)
AS647 DNIC-ASBLK-00616-00665 US (United States)
AS664 DNIC-ASBLK-00616-00665 US (United States)
AS665 DNIC-ASBLK-00616-00665 US (United States)
AS668 DNIC-AS-00668 US (United States)
AS670 DNIC-AS-00670 US (United States)
AS671 DNIC-AS-00671 US (United States)
AS672 DNIC-AS-00672 US (United States)
AS673 DNIC-AS-00673 US (United States)
AS675 MSUS-AS US (United States)
AS676 United Nations Development Programme AR (Argentina)
AS679 Technische Universitat Wien AT (Austria)
AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V. DE (Germany)
AS681 University of Waikato NZ (New Zealand)
AS683 ARGONNE-AS US (United States)
AS687 DNIC-AS-00687 US (United States)
AS688 RECNET-AS US (United States)
AS692 CuroTec ApS DK (Denmark)
AS693 NOTRE-DAME-AS US (United States)
AS698 ASN-UIUC-REGION-AS US (United States)
AS701 UUNET US (United States)
AS702 UUNET US (United States)
AS703 UUNET US (United States)
AS705 UUNET US (United States)
AS706 TEST-AUSTIN-IBM-AS US (United States)
AS715 WOODYNET-2 US (United States)
AS719 Elisa Oyj FI (Finland)
AS721 DNIC-ASBLK-00721-00726 US (United States)
AS722 DNIC-ASBLK-00721-00726 US (United States)
AS744 AFCONC-BLOCK2-AS US (United States)
AS745 AFCONC-BLOCK2-AS US (United States)
AS747 DNIC-AS-00747 US (United States)
AS749 DNIC-AS-00749 US (United States)
AS760 Vienna University Computer Center AT (Austria)
AS763 IBM-PEN-TEST US (United States)
AS764 FI-PMO-AS Prime Ministers Office EU
AS766 Entidad Publica Empresarial ES (Spain)
AS773 PARSONS-PGS-2 US (United States)
AS775 Renater EU
AS776 Renater EU
AS777 CEA-Saclay EU
AS780 Renater EU
AS781 Renater EU