AS500

AS500 is a U.S. military autonomous system number delegated by ARIN to "Air Force Systems Networking" (ARIN OrgID 7ESG), an organizational entity registered at Maxwell AFB–Gunter Annex, Alabama — part of the U.S. Air Force / Department of Defense. Structurally, AS500 is not an individually-registered ASN: ARIN's RDAP record returns a single block registration, handle AS379, spanning startAutnum 379 through endAutnum 508 and named AFCONC-BLOCK1-AS, so every ASN in that 130-number range (including AS500) shares one registration record and one set of top-level registration/last-changed dates. Live routing data shows AS500 is a small, low-traffic stub network: it currently originates six IPv4 /24 prefixes in the 55.224.129.0–134.0 range (1,536 addresses total) and no IPv6 space, is seen by nearly all RIS peers for IPv4 but zero for IPv6, and CAIDA's AS-relationship data describes it as having exactly one upstream provider and no observed peers or customers. No dedicated operator website, published peering policy, or notable public abuse history was located, consistent with a government-administrative network that maintains minimal public footprint rather than commercial visibility.

Operator

Air Force Systems Networking (U.S. Air Force / Department of Defense; ARIN OrgID 7ESG), registered address 501 East Moore Dr., Bldg 884 Rm 1100, Gunther Annex, Maxwell AFB, AL 36114 [Confirmed] — https://rdap.arin.net/registry/autnum/500

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/500

Allocated

1989-08-04 (RDAP autnum top-level eventAction="registration"); last changed 2008-06-06 (eventAction="last changed") [Confirmed] — https://rdap.arin.net/registry/autnum/500

Org status

active (ARIN RDAP autnum status field) [Confirmed] — https://rdap.arin.net/registry/autnum/500

Contacts

abuse/admin/technical contact disa.columbus.ns.mbx.arin-registrations@mail.mil (DISA-Columbus, 300 North James Road, Whitehall, OH 43213; tel +1-844-347-2457 ext2) [Confirmed] — https://rdap.arin.net/registry/autnum/500

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-10 — AS500 does not appear in Spamhaus DROP/ASN-DROP FAQ pages or NANOG/seclists hijack-discussion archives searched; the live Spamhaus ASN-DROP text file and BGPView API were not directly queried in this pass (only landing/FAQ pages), so this reads as low visibility rather than a confirmed clean record

Network & routing

Network type

military/government internal network (U.S. Air Force/DoD), not a commercial ISP or content network [Confirmed] — https://rdap.arin.net/registry/autnum/500

Size

6 IPv4 /24 prefixes announced (55.224.129.0/24–55.224.134.0/24; 1,536 addresses); 0 IPv6 prefixes announced [Confirmed] — https://stat.ripe.net/AS500

Routing/peering

stub AS — CAIDA AS-degree shows 1 total relationship (1 provider, 0 peer, 0 customer); RIPEstat reports 1 observed neighbour (unidentified); IPv4 visibility 325/327 RIS peers, IPv6 0/321; no PeeringDB net entry found for AS500 (API query returned 404), though an unrelated-looking PeeringDB org entry (org/20118) surfaced with no AS500-specific detail [Confirmed for BGP/CAIDA figures; Unknown/unresolved for PeeringDB presence] — https://asrank.caida.org/asns/500, https://www.peeringdb.com/api/net?asn=500

RPKI

not tested — RIPEstat's rpki-validation endpoint requires a --prefix parameter and was skipped in this fetch; no ROA validity data available for any of the 6 announced prefixes [Unknown] — https://stat.ripe.net/AS500

Routing history

first seen originating 165.201.0.0/16 on 2001-09-09; most recently seen originating 55.224.129.0/24 on 2026-07-10; CAIDA AS rank #30,803, clique member [Confirmed] — https://stat.ripe.net/AS500, https://asrank.caida.org/asns/500

Notable usage

Unknown from operator-official sources — no dedicated website or published peering policy found; BGP-observed footprint is limited to a small, low-address stub network [Confirmed-absence for website/policy; Unknown for broader usage] — https://www.peeringdb.com/api/net?asn=500

Registration record

AS500 shares a single ARIN block registration with AS379–AS508 (handle AS379, name AFCONC-BLOCK1-AS); allocated/last-changed dates below are the block's top-level autnum events, not an AS500-specific record [Confirmed] — https://rdap.arin.net/registry/autnum/500

Related registration / possible unit link

part of the AFCONC-BLOCK1-AS block (AS379–AS508); a possible administrative association with the USAF 754th Electronic Systems Group (Maxwell AFB–Gunter Annex) surfaced only via WebSearch result snippets — direct fetch of hanscom.af.mil returned HTTP 403 and could not be confirmed on-page [Likely] — https://www.hanscom.af.mil/News/Article-Display/Article/381978/754-elsg-division-shapes-supports-it-purchases-across-dod/

Analyst note

RDAP entity-level dates (REGIS10-ARIN entity registered 2009-06-24/last changed 2026-02-12; 7ESG registrant org registered 2008-06-05/last changed 2025-03-13) are contact-record decoys and were correctly excluded from allocated_date/last_updated, which instead reflect the autnum's top-level block-registration events.