AS452

AS452 is a legacy autonomous system number administered under ARIN as one number within a contiguous block registration, AFCONC-BLOCK1-AS (ARIN handle AS379, range AS379–AS508), held by "Air Force Systems Networking" — a U.S. Department of Defense / United States Air Force network whose registry contacts route through DISA. Because ARIN registered the block as a single autnum object, the RDAP record for AS452 resolves into the AS379 block object, and its top-level registration event (1989-08-04) and last-changed event (2008-06-06) are block-level registry dates that apply across the whole AS379–AS508 range, including AS452. The key triage point is that AS452 is effectively dormant today: RIPEstat reports it as not announced (announced: false, empty announced-prefixes), CAIDA AS Rank places it at 79,459 with a singleton customer cone and an AS degree of zero across customer/peer/provider, and no RIS peers currently see it (0/325 v4, 0/321 v6). It was, however, announced historically — RIPEstat routing-status shows origination from 2019-11-09 (140.16.204.0/24) through 2025-07-15 (131.37.228.0/24), after which it went quiet. RPKI posture is not assessable because there are no current originations to validate. No notable public abuse signal was found as of 2026-07-02 — not in Spamhaus, AbuseIPDB, CleanTalk, or NANOG archives — consistent with a small, non-transit DoD network with low public visibility.

Operator

Air Force Systems Networking (U.S. DoD / USAF; ARIN registrant org handle 7ESG, Maxwell AFB / Gunter Annex, AL) [Confirmed] — https://rdap.arin.net/registry/autnum/452

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin); CAIDA AS Rank country ISO US

Allocated

1989-08-04 (ARIN registry TOP-LEVEL autnum registration event on the AS379–AS508 block object covering AS452; a first-party RIR fact, NOT an IEEE date); last changed 2008-06-06 [Confirmed] — https://rdap.arin.net/registry/autnum/452 (top-level events[], entity-level 2009-06-24 / 2026-02-12 / 2025-03-13 dates excluded as contact/registrant decoys)

Org status

active per ARIN RDAP status array (inherited from the parent AS379/AFCONC-BLOCK1-AS block record); the registrant org is a U.S. government entity that has since been redesignated multiple times [Confirmed for registry status] — https://rdap.arin.net/registry/autnum/452. Third-party BGP data suggests the ASN is currently dormant/unannounced, a routing observation rather than a registry change

[Confirmed] — RIPEstat as-overview

Contacts

abuse disa.columbus.ns.mbx.arin-registrations@mail.mil (DISA-Columbus, 300 North James Road, Whitehall, OH 43213; +1-844-347-2457 ext2); registrant Air Force Systems Networking, 501 East Moore Dr. Bldg 884 Rm 1100 Gunter Annex, Maxwell AFB, AL 36114

[Confirmed] — https://rdap.arin.net/registry/autnum/452, RIPEstat abuse-contact-finder

Website

Unknown / none found — no operator-official about, peering-policy, or IR page exists for AS452, AFCONC-BLOCK1-AS, or "Air Force Systems Networking" as a distinct public entity [Unknown] — A2 operator-official search

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-02 — not in Spamhaus, AbuseIPDB, CleanTalk (0.00% spam), or NANOG archives; small non-transit DoD network with low public visibility

Network & routing

Network type

U.S. government / military network (DoD / USAF), administered by DISA; not a commercial ISP, hosting, content, or transit network [Confirmed] — https://rdap.arin.net/registry/autnum/452

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes currently; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — RIPEstat routing-status / CAIDA AS Rank (2026-07)

Routing/peering

NOT announced — 0 RIS peers seeing it (0/325 v4, 0/321 v6); CAIDA degree total 0 (customer 0, peer 0, provider 0), cliqueMember false [Confirmed] — RIPEstat routing-status, CAIDA AS Rank. No operator-official peering policy is published; DISA frames peering for this network class as gated at the DoD-wide DISN boundary, not negotiated per-ASN

[Likely] — https://www.peeringdb.com/org/20118

Historical routing

announced in BGP between 2019-11-09 (first_seen 140.16.204.0/24) and 2025-07-15 (last_seen 131.37.228.0/24), then went quiet [Confirmed] — RIPEstat routing-status API, resource=452

RPKI

not assessable — AS452 announces no prefixes, so there are no ROAs to validate (RIPEstat rpki-validation skipped, no prefix to check) [Confirmed] — RIPEstat rpki-validation note

Notable usage

none documented on any operator-official source; AS452 is one of 130 contiguous numbers (AS379–AS508) allocated as a legacy block for USAF/DoD internal networking, with no AS452-specific public service documented [Likely] — https://rdap.arin.net/registry/autnum/452, https://bgp.he.net/AS452

Registry block

AFCONC-BLOCK1-AS (ARIN handle AS379, block range AS379–AS508); AS452 is a within-block number [Confirmed] — https://rdap.arin.net/registry/autnum/452

Analyst note

Encountered as a dormant, block-registered legacy ASN under a U.S. DoD/USAF registrant. RDAP resolves via the AS379 block object; registry dates are block-level and apply to AS452. Clean, currently-unannounced ASN with a documented historical routing window (2019–2025).