AS497

AS497 is a legacy autonomous system number registered under ARIN as part of the contiguous AFCONC-BLOCK1-AS range (AS379–AS508), assigned to Air Force Systems Networking, an organizational entity administered by the 754th Electronic Systems Group / DISA on behalf of the U.S. Air Force and Department of Defense. The RDAP registry record for this block carries a top-level registration date of 1989-08-04, with the record last changed on 2008-06-06. AS497 is not a commercial or peering-facing network; it has no public operator website, and its only listed contact is an institutional DISA-Columbus mailbox (disa.columbus.ns.mbx.arin-registrations@mail.mil) rather than a NOC or abuse desk. Historically, AS497 did originate address space in the global routing table — RIPEstat records first seeing it announce 129.54.0.0/16 on 2000-08-18 and last seeing it announce 143.156.64.0/18 on 2020-12-04 — but it has been unannounced since, with HE.net noting no visibility since 2020-12-11. Zero RIS peers currently see it, and CAIDA's customer cone reduces it to a singleton with no measurable AS degree. No public abuse signal was found: it is absent from Spamhaus's ASN-DROP list, and no NANOG archive discussion references it. RPKI posture cannot be assessed because the ASN currently announces no prefixes, leaving no ROAs to validate.

Operator

Air Force Systems Networking (ARIN org handle 7ESG), registered under block name AFCONC-BLOCK1-AS, administered by DISA-Columbus / 754th Electronic Systems Group on behalf of the U.S. Air Force / DoD [Confirmed] — https://rdap.arin.net/registry/autnum/497

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/497

Allocated

1989-08-04 (ARIN RDAP autnum top-level registration event for the AS379–AS508 block covering AS497); last changed 2008-06-06 [Confirmed] — https://rdap.arin.net/registry/autnum/497

Org status

active in the ARIN registry (org 7ESG last updated 2025-03-13) but operationally dormant, unannounced in global BGP since 2020-12-11 [Confirmed] — https://rdap.arin.net/registry/autnum/497, https://bgp.he.net/AS497

Contacts

disa.columbus.ns.mbx.arin-registrations@mail.mil; +1-844-347-2457 ext2 (DISA-Columbus, Whitehall, OH); registrant org address 501 East Moore Dr. Bldg 884 Rm 1100 Gunther Annex, Maxwell AFB, AL 36114 [Confirmed] — https://rdap.arin.net/registry/autnum/497

Website

Unknown / none public — this is a non-commercial DoD/Air Force address block with no consumer- or peering-facing operator site [Unknown] — https://rdap.arin.net/registry/autnum/497

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-10 — not on Spamhaus ASN-DROP, no NANOG archive hits; consistent with a long-unannounced ASN

Network & routing

Network type

U.S. federal government / military network (non-commercial); no public operator website or peering policy [Confirmed] — https://rdap.arin.net/registry/autnum/497

Size / status

currently unannounced — 0 IPv4 and 0 IPv6 prefixes, 0 RIS peers seeing it (0/327 v4, 0/321 v6); customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — https://stat.ripe.net/AS497, https://asrank.caida.org/asns/497

Routing/peering

not currently announced; historically first seen announcing 129.54.0.0/16 on 2000-08-18, last seen announcing 143.156.64.0/18 on 2020-12-04; HE.net notes no visibility in the global table since 2020-12-11, with a single historical peer, AS27064 (DoD Network Information Center) [Confirmed for RIPEstat routing history / Likely for the HE.net peer detail] — https://stat.ripe.net/AS497, https://bgp.he.net/AS497

RPKI

not assessable — AS497 announces no prefixes, so RIPEstat's rpki-validation could not be run (requires a --prefix parameter) [Unknown] — https://stat.ripe.net/AS497

Notable usage

dormant DoD/Air Force address block; no consumer- or peering-facing service; abuse contact is an institutional DISA-Columbus mailbox rather than a commercial NOC [Confirmed] — https://rdap.arin.net/registry/autnum/497

Related ASNs

part of the contiguous ARIN block AS379–AS508 (AFCONC-BLOCK1-AS), same registrant org (7ESG) as neighboring Air Force ASNs [Confirmed] — https://rdap.arin.net/registry/autnum/497

Analyst note

dormant U.S. military/DoD ASN inside a shared ARIN block; allocated_date recorded from the RDAP autnum top-level registration event per registry-date policy (entity-level dates for REGIS10-ARIN and org 7ESG are decoys and were not used); no fabricated dates, no invented IANA/RFC references.