AS374

AS374 is a legacy, low-numbered autonomous system number registered under ARIN with the AS name BROOKS-AS and the registrant organization "Air Force Systems Networking" (ARIN org handle 7ESG), based at Maxwell AFB, Alabama. The ARIN RDAP autnum top-level record dates its allocation to 1989-07-18, placing it among the earliest ASNs issued in the ARIN region and consistent with a U.S. Air Force / Department of Defense heritage. Administrative, technical, and abuse contact for the record is handled by DISA-Columbus (the Defense Information Systems Agency, contact handle REGIS10-ARIN) at 300 North James Road, Whitehall, OH, with the abuse mailbox disa.columbus.ns.mbx.arin-registrations@mail.mil. The operationally important fact for triage is that AS374 is effectively dark: RIPEstat's as-overview reports announced=false, the announced-prefixes query returned empty arrays for both IPv4 and IPv6, and 0 of 323 v4 and 0 of 322 v6 RIS peers observe any announcement. Its only historical footprint is 140.140.0.0/16, first seen 2000-08-18 and last seen 2003-12-28 — nothing since. CAIDA AS Rank corroborates the dormancy: rank 79459, a customer cone consisting solely of itself (1 ASN, 0 prefixes, 0 addresses), an AS degree of zero across customer/peer/provider, cliqueMember=false, not seen, no IXP membership, and placeholder (0,0) coordinates. RPKI posture is not assessable because there are no announced prefixes to validate against ROAs. No notable public abuse signal was found as of 2026-07-02 across Spamhaus, AbuseIPDB, CleanTalk, NANOG archives, and the Hurricane Electric BGP toolkit — consistent with a dormant, government-administered ASN with no public routing footprint.

Operator

Air Force Systems Networking (ARIN org handle 7ESG); registration administered by DISA-Columbus (Defense Information Systems Agency, contact handle REGIS10-ARIN) [Confirmed] — ARIN RDAP autnum (https://rdap.arin.net/registry/autnum/374)

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin) (https://stat.ripe.net/AS374)

Allocated

1989-07-18 (ARIN RDAP autnum TOP-LEVEL registration event for AS374 — a first-party RIR registry fact, NOT the nested REGIS10-ARIN/7ESG entity dates of 2009-06-24 / 2008-06-05); last changed 2008-08-20 [Confirmed] — ARIN RDAP autnum top-level events (https://rdap.arin.net/registry/autnum/374)

AS name

BROOKS-AS [Confirmed] — ARIN RDAP; RIPEstat as-overview holder "BROOKS-AS - Air Force Systems Networking" (https://rdap.arin.net/registry/autnum/374, https://stat.ripe.net/AS374)

Org status

active per ARIN RDAP status field, but operationally dormant in the global routing table; one of the earliest ARIN-region ASNs, consistent with a legacy DoD allocation [Confirmed] — ARIN RDAP (https://rdap.arin.net/registry/autnum/374)

Contacts

abuse/admin/technical disa.columbus.ns.mbx.arin-registrations@mail.mil (REGIS10-ARIN, DISA-Columbus, 300 North James Road, Whitehall, OH 43213); registrant org 7ESG at 501 East Moore Dr. Bldg 884 Rm 1100 Gunther Annex, Maxwell AFB, AL 36114

[Confirmed] — ARIN RDAP, RIPEstat (https://rdap.arin.net/registry/autnum/374, https://stat.ripe.net/AS374)

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-02 — not in Spamhaus, AbuseIPDB, CleanTalk, NANOG archives, or the HE BGP toolkit; dormant government-administered ASN

Network & routing

Network type

U.S. federal government / military network — legacy ASN for United States Air Force network infrastructure, registration administered by DISA; not a commercial ISP, content, or eyeball network [Confirmed] — ARIN RDAP (https://rdap.arin.net/registry/autnum/374)

Size

dark — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes announced; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — RIPEstat routing-status / CAIDA AS Rank (https://stat.ripe.net/AS374, https://asrank.caida.org/asns/374)

Routing/peering

NOT announced (announced=false) — 0/323 v4 and 0/322 v6 RIS peers see it; CAIDA AS degree total 0 (customer 0, peer 0, provider 0); 0 observed neighbours; no upstreams or peers in any source [Confirmed] — RIPEstat, CAIDA (https://stat.ripe.net/AS374, https://asrank.caida.org/asns/374)

Historical routing

last originated 140.140.0.0/16, first seen 2000-08-18, last seen 2003-12-28; no announcements since [Confirmed] — RIPEstat routing-status (https://stat.ripe.net/AS374)

RPKI

not assessable — AS374 announces no prefixes, so there are no ROAs to validate (RIPEstat rpki-validation skipped for lack of a prefix) [Confirmed] — RIPEstat (https://stat.ripe.net/AS374)

Peering policy

none active (AS374 announces nothing); not listed on PeeringDB. Any DoD connectivity would be governed internally via DISA's DISN, not a public peering policy [Likely] — bgp.he.net/AS374, disa.mil

Notable usage

none publicly documented; the ASN has been dark in the global routing table since 2003 and appears used only internally or held legacy [Confirmed] — bgp.he.net/AS374, RIPEstat (https://stat.ripe.net/AS374)

Analyst note

Encountered as a dark legacy DoD ASN. Registrant of record (7ESG, "Air Force Systems Networking", Maxwell AFB) and the administrative/abuse contact (DISA-Columbus) are two distinct entity records in the same RDAP response — DISA is the administrator of record, not necessarily an operator in a branding sense. A Qrator Radar page rendered a Prague address for AS374; treated as an unverified third-party data artifact contradicting the ARIN record and NOT recorded. No first-party source tied AS374 to a specific Air Force unit (e.g. 754th ESG), so that association was not asserted.