AS453

AS453 is a legacy 16-bit autonomous system number registered under ARIN to Air Force Systems Networking, a U.S. Department of the Air Force networking organization administered through DISA. It does not resolve to a discrete per-ASN RDAP object; instead ARIN returns the shared block record (handle AS379, ASName AFCONC-BLOCK1-AS, startAutnum 379 / endAutnum 508), meaning AS453 is one of 130 contiguous numbers in a single legacy allocation held by the Air Force — the same block-record pattern seen in already-processed siblings AS379, AS385, AS386, AS390, AS391, and AS452. The key triage point for AS453 is that it is unrouted today: every routing source consulted (RIPEstat, CAIDA AS Rank) agrees it announces zero IPv4 and zero IPv6 prefixes, is seen by zero RIS peers (0/325 v4, 0/321 v6), has zero CAIDA-observed degree (customer 0, peer 0, provider 0), and a singleton customer cone (itself, 0 prefixes, 0 addresses). Its CAIDA AS rank of 79,459 sits near the bottom of the global ranking, consistent with an ASN that carries no global routing-table presence. The block's top-level ARIN registration event dates to 1989-08-04, with a last-changed event of 2008-06-06. RPKI posture cannot be assessed because there are no active originations and therefore no ROAs. No operator-official website, PeeringDB record, or published peering policy exists for AS453 as a distinct entity — expected for a DoD internal allocation, where DISA gates DISN connectivity centrally rather than via per-ASN peering. No notable public abuse signal was found as of 2026-07-02 — not in Spamhaus DROP, general blacklist sources, or NANOG archives — consistent with a clean, effectively non-routed government ASN.

Operator

Air Force Systems Networking (ARIN registrant org handle 7ESG; U.S. Air Force, Maxwell AFB / Gunter Annex, AL) [Confirmed] — ARIN RDAP autnum block record (handle AS379, ASName AFCONC-BLOCK1-AS)

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin), CAIDA country.iso US

Allocated

1989-08-04 (ARIN registry top-level autnum registration event, NOT an IEEE date — IEEE publishes no ASN registration dates); last changed 2008-06-06 [Confirmed] — ARIN RDAP autnum top-level events (nested entity dates 2008-06-05 / 2009-06-24 / 2025-03-13 / 2026-02-12 are decoys and excluded)

Org status

active per ARIN RDAP status (inherited from parent block record); Air Force Systems Networking is a standing U.S. Air Force organization. No operator-official confirmation of current operational routing activity; third-party BGP data suggests no active global routing presence [Confirmed for RDAP status; Unknown for operational-use confirmation] — ARIN RDAP

Contacts

abuse contact disa.columbus.ns.mbx.arin-registrations@mail.mil (DISA-Columbus, Whitehall, OH); registrant address Maxwell AFB, AL [Confirmed] — RIPEstat abuse-contact-finder, ARIN RDAP

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-02 — not in Spamhaus DROP, general bad-ASN lists, or NANOG archives; effectively non-routed government ASN [Likely] — spamhaus.org/blocklists/do-not-route-or-peer, github.com/brianhama/bad-asn-list (sourced null; live per-ASN reputation APIs not directly queryable this pass)

Network & routing

Network type

U.S. government/military network (DoD, U.S. Air Force), administered by DISA; not a commercial ISP/hosting/transit network. AS453 is legacy/inactive (unrouted) [Confirmed] — ARIN RDAP, DISA DISN Connect references

Size

unrouted — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses — 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); observed_neighbours 0; no upstreams or peers visible [Confirmed]. No published peering policy; no PeeringDB network record (peeringdb.com/asn/453 returned 404); DISA gates DISN connectivity centrally [Confirmed]

RPKI

not assessable — AS453 announces no prefixes, so there are no ROAs to validate; rpki-validation skipped for lack of an announced prefix [Confirmed]

Notable usage

none documented on any operator-official source. AS453 is one of 130 contiguous numbers (AS379–AS508) in the legacy AFCONC-BLOCK1-AS allocation held by the U.S. Air Force [Confirmed] — ARIN RDAP block record

Related ASNs

block-mates AS379–AS508 (AFCONC-BLOCK1-AS), including already-processed siblings AS379, AS385, AS386, AS390, AS391, AS452 [Confirmed] — ARIN RDAP block record

Analyst note

Encountered as an unrouted legacy DoD ASN; ARIN RDAP resolves to the shared AS379 block record (AS379–AS508), not a discrete per-ASN object. Clean, inactive ASN. bgp.he.net / bgp.tools per-ASN pages were not directly retrievable this pass (WebSearch surfaced only block-mate ASNs) — routing-inactivity finding rests on RIPEstat + CAIDA, which agree.