AS440

AS440 is a legacy autonomous system number administered under ARIN as part of a large flat-range block registration rather than a standalone object. A direct RDAP query for autnum 440 resolves to the enclosing block record handle AS379, name AFCONC-BLOCK1-AS, spanning startAutnum 379 through endAutnum 508; AS440 falls inside that range and inherits the block's registrant, organization, and dates. The registrant is the entity handle 7ESG — "Air Force Systems Networking" — at Maxwell AFB, Alabama, a U.S. Department of the Air Force / Department of Defense allocation, with ARIN registration and abuse contact administered by DISA (Defense Information Systems Agency) out of its Columbus field office. The key triage point for AS440 is that it is effectively dormant: RIPEstat reports it is not announced (0 IPv4 / 0 IPv6 prefixes across the recent window), CAIDA AS Rank places it at 79,459 with a singleton customer cone (1 ASN, 0 prefixes, 0 addresses) and an AS degree of zero across customer/peer/provider, and bgp.he.net notes it has had no global routing-table visibility since 2023-01-21. Its last known origination was a bogon-flagged prefix (132.3.52.0/22), and the only historically observed peer was AS27064 (DoD Network Information Center). No notable public abuse signal was found as of 2026-07-02 — not in Spamhaus DROP/ASN-DROP, NANOG archives, or general threat-intel search — which is expected and neutral for a dormant government-block allocation. RPKI posture is not assessable because the ASN announces no prefixes. Its allocated_date is recorded from the block's top-level ARIN registration event, 1989-08-04, as a first-party RIR fact.

Operator

Air Force Systems Networking (registrant entity handle 7ESG, U.S. Department of the Air Force / DoD); ARIN registration and abuse contact administered by DISA Columbus [Confirmed] — https://rdap.arin.net/registry/autnum/440, https://whois.arin.net/rest/org/7ESG

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin), https://rdap.arin.net/registry/autnum/440

Allocated

1989-08-04 (ARIN top-level registration event for the AS379–508 block covering AS440; a first-party RIR fact, recorded not nulled — NOT an IEEE date); last changed 2008-06-06 [Confirmed] — https://rdap.arin.net/registry/autnum/440 (autnum top-level events)

Org status

ARIN registry status active (for the block object); routing/operational status dormant, not currently announced [Confirmed] — https://rdap.arin.net/registry/autnum/440, https://bgp.he.net/AS440

Website

no dedicated AS440 or "Air Force Systems Networking" operator site; administering-agency official sites are https://www.disa.mil/ and https://help.disa.mil/network-connections/ (the latter lists DISN connection services; its support phone 1-844-347-2457 matches the RDAP admin/abuse contact number)

[Confirmed] — https://help.disa.mil/network-connections/

Contacts

abuse/registration disa.columbus.ns.mbx.arin-registrations@mail.mil; tel +1-844-347-2457 ext.2; registrant address 501 East Moore Dr, Bldg 884 Rm 1100 Gunther Annex, Maxwell AFB, AL 36114, US [Confirmed] — https://rdap.arin.net/registry/entity/REGIS10-ARIN, https://whois.arin.net/rest/org/7ESG

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-02 — not in Spamhaus DROP or ASN-DROP, NANOG archives, or general abuse/threat-intel search (AbuseIPDB, CleanTalk, C0nw0nk ASN-BlackList, Cyberbro, Talos/Check Point/CERT-EU); the bgp.he.net bogon flag on 132.3.52.0/22 is a route-visibility/allocation-status heuristic, not a documented abuse event

Network & routing

Network type

U.S. government/military network block (Air Force / DoD), non-commercial, administered by DISA; not an ISP, hosting provider, or IXP participant [Confirmed] — https://rdap.arin.net/registry/autnum/440, https://bgp.he.net/AS440

Size

dormant — 0 IPv4 prefixes / 0 IPv6 prefixes announced; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — https://stat.ripe.net/AS440, https://api.asrank.caida.org/v2/restful/asns/440

Routing/peering

NOT announced — RIPEstat shows announced:false with 0 prefixes over the 2026-06-18 to 2026-07-02 window; CAIDA degree total 0 (customer 0, peer 0, provider 0); no upstreams or peers observed; historically routed through ~2023-01-21 (last-seen prefix 132.3.52.0/22)

[Confirmed] — https://stat.ripe.net/AS440, https://bgp.he.net/AS440

Peering policy

Unknown — no PeeringDB network object for AS440 (peeringdb.com/api/net?asn=440 → HTTP 404); no public per-ASN peering policy document located [Unknown] — https://www.peeringdb.com/api/net?asn=440

RPKI

not assessable — AS440 announces no prefixes, so there are no ROAs to validate; RIPEstat rpki-validation was skipped for lack of an announced prefix [Unknown] — https://stat.ripe.net/AS440

Notable usage

not currently visible in the global BGP table (no visibility since 2023-01-21 per bgp.he.net); last known origination was a bogon-flagged prefix 132.3.52.0/22; only historically observed peer was AS27064 (DoD Network Information Center); no evidence of current production use

[Likely] — https://bgp.he.net/AS440

Related ASNs

AS379–AS508 (the flat AFCONC-BLOCK1-AS registration block that AS440 sits within); AS27064 (DoD Network Information Center, the only historically observed BGP peer) [Confirmed for block/peer] — https://rdap.arin.net/registry/autnum/440, https://bgp.he.net/AS440

Registry record note

AS440 has no standalone ARIN registration object; RDAP for autnum 440 resolves to block record handle AS379 (AFCONC-BLOCK1-AS), covering startAutnum 379–endAutnum 508, and AS440 inherits the block's registrant/org/date [Confirmed] — https://rdap.arin.net/registry/autnum/440

Analyst note

Encountered as a dormant legacy DoD/Air Force ASN with no standalone RDAP object — the autnum 440 query legitimately returns the enclosing AS379–508 block (confirmed stable across refetch, and cross-agreed by RIPEstat resource:440 and CAIDA asn:440, both AFCONC-BLOCK1-AS). Dates were taken strictly from the autnum TOP-LEVEL events (1989-08-04 / 2008-06-06), not the nested entity events (2009-06-24 / 2008-06-05), which were excluded as decoys. Clean, inactive government ASN.