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
AS566 SSC-299-Z-566 CA (Canada)
AS571 DNIC-AS-00571 US (United States)
AS572 GBMC-TOW US (United States)
AS575 DNIC-AS-00575 US (United States)
AS577 BACOM CA (Canada)
AS580 DNIC-AS-00580 US (United States)
AS589 UNT-CAMPUS-AS US (United States)
AS596 CENTURYLINK-LEGACY-LVLT-596 US (United States)
AS598 CENTURYLINK-LEGACY-LVLT-598 US (United States)
AS600 OARNET-AS US (United States)
AS603 BACOM2-AS US (United States)
AS606 SCHAT-AS US (United States)
AS607 AS-NICO1 US (United States)
AS611 NECN-1-611 CA (Canada)
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)
AS656 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 The 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)
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)
AS714 APPLE-ENGINEERING 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)

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