AS481

AS481 sits inside a legacy ARIN block registration named AFCONC-BLOCK1-AS, which spans AS379 through AS508 and is registered as a single unit rather than as an individually-issued autonomous system number. The RDAP record's registrant organization is "Air Force Systems Networking" (handle 7ESG), a U.S. Air Force / Department of Defense entity headquartered at Maxwell AFB, Alabama, with an abuse/administrative contact routed through DISA-Columbus. The block's top-level RDAP registration event is dated 1989-08-04, with a last-changed event of 2008-06-06; these dates apply to the covering block record, since AS481 has no separate individually-dated autnum object. Today the ASN carries no active routing footprint: RIPEstat reports it as not announced, with zero IPv4 and zero IPv6 prefixes and zero RIS peers observing it, and CAIDA AS Rank corroborates this with a "seen: false" flag, a customer cone limited to the ASN itself, and zero measured AS-relationship degree. The only historical routing activity found is a single, brief announcement of 132.49.0.0/16 spanning late September to late October 2001 — roughly a one-month window, more than two decades in the past — after which the block returns to permanent dormancy. No PeeringDB network object exists for AS481, and no public abuse, hijack, or reputation signal was found across ipinfo.io, general abuse-database searches, or NANOG-style community sources, consistent with a dormant military-held legacy allocation rather than a live operational network.

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/481, https://stat.ripe.net/data/abuse-contact-finder/data.json?resource=481

Allocated

1989-08-04 (ARIN RDAP autnum TOP-LEVEL "registration" event for the AFCONC-BLOCK1-AS block covering AS481); last changed 2008-06-06 [Confirmed] — https://rdap.arin.net/registry/autnum/481 (nested entity-level dates for org 7ESG and POC REGIS10-ARIN were excluded as decoys per RDAP structure)

Contacts

DISA-Columbus abuse/admin/technical contact, disa.columbus.ns.mbx.arin-registrations@mail.mil, +1-844-347-2457 ext2 (handle REGIS10-ARIN) [Confirmed] — https://rdap.arin.net/registry/autnum/481, https://stat.ripe.net/data/abuse-contact-finder/data.json?resource=481

Website

no dedicated public/operator-run website confirmed specifically for AS481 or Air Force Systems Networking as a discrete entity [Unknown] — https://www.aflcmc.af.mil/WELCOME/Organizations/Cyber-Networks/

Abuse/security signal

no notable public abuse, hijack, or reputation signal found as of 2026-07-10 across ipinfo.io and general abuse-database/NANOG-style searches; consistent with a dormant, unannounced block with no live attack surface

Network & routing

Network type

government/military network (U.S. Air Force / DoD), not a commercial ISP; legacy block registration rather than an individually-issued ASN [Confirmed] — https://rdap.arin.net/registry/autnum/481

Routing status

NOT currently announced — RIPEstat as-overview reports announced:false, zero prefixes in the announced-prefixes window (2026-06-26 to 2026-07-10), and 0 of 326 v4 / 0 of 321 v6 RIS peers seeing it [Confirmed] — https://stat.ripe.net/data/as-overview/data.json?resource=481, https://stat.ripe.net/data/announced-prefixes/data.json?resource=481

Historical routing

single brief announcement of 132.49.0.0/16, first seen 2001-09-26, last seen 2001-10-23 (~1-month window, over two decades ago) [Confirmed] — https://stat.ripe.net/data/routing-status/data.json?resource=481

CAIDA metrics

AS rank 79459; not a clique member; seen:false; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses; AS-relationship degree total 0 (customer 0, peer 0, provider 0) [Confirmed] — https://api.asrank.caida.org/v2/restful/asns/481

RPKI

not assessable — no prefixes are currently announced under AS481, so RIPEstat's rpki-validation could not be evaluated (requires a specific prefix parameter) [Unknown] — https://stat.ripe.net/data/rpki-validation/data.json?resource=481

Peering

no PeeringDB network object exists for AS481; the PeeringDB org for Air Force Systems Networking (org id 20118) lists sibling ASNs (AS123, AS65, AS175, AS221, AS301) but not AS481 [Confirmed absence] — https://www.peeringdb.com/org/20118

ASN / registrant

AS481, block AFCONC-BLOCK1-AS (RDAP handle AS379, spans AS379–AS508); registrant org 7ESG — "Air Force Systems Networking," Maxwell AFB, AL, United States [Confirmed] — https://rdap.arin.net/registry/autnum/481

Status per registry vs. per data provider

ARIN RDAP marks the record "active" (i.e. the registration exists); ipinfo.io separately reports AS481 as "Inactive" with 0 IPv4/IPv6 addresses [Confirmed for ARIN status; Likely for ipinfo.io Inactive label] — https://rdap.arin.net/registry/autnum/481, https://ipinfo.io/AS481

IANA RFC reference

none found; left blank rather than fabricated [Unknown]

Analyst note

A dormant legacy military ASN inside a block-level ARIN registration (AS379–AS508). Routing sources unanimously agree on zero current announcements; the only routing history is a one-month window in 2001.