AS477

AS477 is a legacy autonomous system number registered under ARIN inside the contiguous block AS379–AS508, named AFCONC-BLOCK1-AS and held by Air Force Systems Networking, an element of the U.S. Department of the Air Force / Department of Defense. Because ARIN registered this range as a single block rather than issuing AS477 its own individual autnum object, RDAP queries for autnum/477 resolve to that block-level record: registrant entity 7ESG ("Air Force Systems Networking," 501 East Moore Dr., Bldg 884 Rm 1100, Gunther Annex, Maxwell AFB, AL), with registry services handled by DISA-Columbus (Defense Information Systems Agency), contact disa.columbus.ns.mbx.arin-registrations@mail.mil. The block's top-level RDAP registration event is dated 1989-08-04, with a last-changed event of 2008-06-06 — these apply to the range as a whole, including AS477, and are distinct from later entity-level edits (registrant org last-changed 2025-03-13; abuse/admin/tech POC last-changed 2026-02-12) which are contact-record housekeeping, not the autnum's own dates. Routing-wise, AS477 is long dormant: RIPEstat shows it unannounced with zero visible prefixes as of query time, and it was last seen announcing 131.16.247.0/24 on 2015-10-20 (first seen announcing 132.38.0.0/16 on 2001-09-26), with zero of 326/321 RIS peers currently seeing it. CAIDA AS Rank places it at 79,459 with a singleton customer cone (0 prefixes, 0 addresses) and zero recorded AS-level relationships. No PeeringDB record exists, no public peering policy could be located, and no notable public abuse/threat-feed signal was found — consistent with an inactive, non-commercial DoD-linked ASN rather than an operationally visible network.

Operator

Air Force Systems Networking (U.S. Department of the Air Force / DoD); ARIN registrant entity 7ESG, 501 East Moore Dr. Bldg 884 Rm 1100 Gunther Annex, Maxwell AFB, AL 36114 [Confirmed] — https://rdap.arin.net/registry/autnum/477

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/477

Allocated

1989-08-04 (ARIN RDAP top-level registration event for the AS379–AS508 block containing AS477, NOT an IEEE date); last changed 2008-06-06 (block-level; entity/contact records were separately last-changed 2025-03-13 and 2026-02-12) [Confirmed] — https://rdap.arin.net/registry/autnum/477

Org status

ARIN record status Active for the AS379-AS508 block, but the ASN itself has not been visible in the global BGP routing table since 2015-10-11 — administratively allocated, operationally dormant [Confirmed] — https://rdap.arin.net/registry/autnum/477, https://bgp.he.net/AS477

Website / PeeringDB

none found — no PeeringDB network record for AS477 (404 on both the network page and API), and no ASN-specific official operator page could be located; only general af.mil/disa.mil institutional pages exist [Unknown] — https://www.peeringdb.com/asn/477

Contacts

disa.columbus.ns.mbx.arin-registrations@mail.mil (abuse/administrative/technical, ARIN handle REGIS10-ARIN) [Confirmed] — https://stat.ripe.net/data/abuse-contact-finder/data.json?resource=477

Security/abuse context (NEUTRAL, DATED)

no notable public abuse or threat-feed signal found as of 2026-07-10 across Spamhaus, AbuseIPDB, and NANOG archives; consistent with a long-dormant, non-routed legacy ASN

Network & routing

Network type

U.S. military/government (Department of the Air Force) networking infrastructure, administered via DISA-Columbus; not a commercial operator [Likely] — https://rdap.arin.net/registry/autnum/477, https://www.wpafb.af.mil/News/Article-Display/Article/1101451/office-supports-af-network/

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses currently announced, 0 IPv6; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — https://stat.ripe.net/AS477, https://api.asrank.caida.org/v2/restful/asns/477

Routing/peering

NOT currently announced — 0 of 326 RIS peers seeing IPv4, 0 of 321 seeing IPv6; CAIDA AS degree total 0 (customer 0, peer 0, provider 0); last routing activity was 131.16.247.0/24, last seen 2015-10-20, first seen (132.38.0.0/16) 2001-09-26; historical BGP data (third-party, bgp.he.net) records a single past peer, AS27139 (US DoD), no longer active [Confirmed for current status; Likely for historical peer] — https://stat.ripe.net/data/routing-status/data.json?resource=477, https://api.asrank.caida.org/v2/restful/asns/477, https://bgp.he.net/AS477

RPKI

not assessable — 0 currently announced prefixes, so no active route to validate against a ROA [Unknown] — https://stat.ripe.net/AS477

Notable usage

no current public/commercial usage; historically originated exactly one IPv4 prefix (131.16.247.0/24) before going dormant in October 2015 [Likely] — https://bgp.he.net/AS477

Related ASNs

part of the ARIN range AS379–AS508 (AFCONC-BLOCK1-AS), a contiguous Air Force-held block [Confirmed] — https://rdap.arin.net/registry/autnum/477

Analyst note

Encountered as a dormant legacy ASN inside a U.S. Air Force block-registration record rather than an individually-issued autnum; the RIR top-level registration date (1989-08-04) belongs to the whole AS379–AS508 range and was correctly recorded, not nulled.