AS241

AS241 is a legacy, low-numbered autonomous system registered under ARIN to Air Force Systems Networking (AFSN), a U.S. Air Force network-engineering unit; the ARIN registrant org carries handle 7ESG and the ASN name OCALC-HOSTNET-AS preserves its origin as host networking for the Oklahoma City Air Logistics Center (OC-ALC). Administrative, technical, and abuse registration for the ASN is handled by DISA-Columbus (Defense Information Systems Agency, Columbus/Whitehall, OH), with the registrant org address at 501 East Moore Dr., Bldg 884, Rm 1100, Gunter Annex, Maxwell AFB, AL 36114. The triage point for AS241 is that it is effectively dormant in the public routing table: RIPEstat, CAIDA AS Rank, and the ARIN/RIPE collectors all agree it announces zero IPv4 and zero IPv6 prefixes, is seen by 0 of 327 RIS v4 peers and 0 of 324 RIS v6 peers, has no observed BGP neighbours, and a customer cone of a single ASN (itself) with 0 prefixes and 0 addresses. Its CAIDA AS rank of 79,459 sits near the bottom of the global ranking, consistent with complete public-routing inactivity. RPKI posture cannot be assessed because there are no active originations and therefore no ROAs. The ARIN autnum top-level registration event dates the allocation to 1988-09-22 (last changed 2008-08-18), placing AS241 among the early NSFNET-era U.S. government allocations. No notable public abuse signal was found as of June 2026 — not on the Spamhaus ASN-DROP list, in NANOG archives, or in BGP hijack/route-leak databases — and Scamalytics rates the associated ISP at 0/100 fraud risk, consistent with a clean, dormant ASN held by a U.S. military operator.

Operator

Air Force Systems Networking (U.S. Air Force unit; ARIN registrant handle 7ESG; ASN name OCALC-HOSTNET-AS) [Confirmed] — ARIN RDAP autnum/241, ipinfo.io/AS241

Country / RIR

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

Allocated

1988-09-22 (ARIN registry date, NOT an IEEE date — IEEE publishes no ASN registration dates); last changed 2008-08-18 [Confirmed] — ARIN RDAP autnum top-level events

Org status

active U.S. federal government / DoD entity; registrant org (handle 7ESG) last updated 2025-03-13 in ARIN, confirming the registration is actively maintained; the ASN itself is dormant [Confirmed] — ARIN RDAP autnum/241, ipinfo.io/AS241

IANA block

1-1876, assigned by ARIN (IANA 16-bit AS Numbers Registry) [Confirmed] — RIPEstat as-overview

Contacts

abuse/admin/tech via DISA-Columbus — disa.columbus.ns.mbx.arin-registrations@mail.mil; org address 501 East Moore Dr, Bldg 884 Rm 1100, Gunter Annex, Maxwell AFB, AL 36114 [Confirmed] — ARIN RDAP autnum/241, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-20 — not on Spamhaus ASN-DROP, in NANOG archives, or in BGP hijack/route-leak databases; Scamalytics rates the associated ISP 0/100 fraud risk [Likely — absence-of-evidence; direct DNSBL/threat-API lookups not performed] — spamhaus.org/drop/asndrop.txt, scamalytics.com/ip/isp/air-force-systems-networking

Network & routing

Network type

U.S. military / U.S. Department of Defense government network; AS241 is legacy and dormant (no public BGP announcements) [Confirmed] — ipinfo.io/AS241, bgp.he.net/AS241

Size

dormant — 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 (2026-06)

Routing/peering

NOT announced — 0 RIS peers seeing it (0/327 v4, 0/324 v6); CAIDA degree total 0 (customer 0, peer 0, provider 0); 0 observed neighbours; no upstreams or peers visible in any source [Confirmed]. No published or PeeringDB peering policy [Confirmed]

RPKI

not assessable — AS241 announces no prefixes, so there are no ROAs to validate; RIPEstat rpki-validation skipped (no prefix supplied) [Confirmed]

Notable usage

handle OCALC-HOSTNET-AS indicates original assignment for host networking at the Oklahoma City Air Logistics Center (OC-ALC, Tinker AFB, OK); AFSN provides network engineering/integration across USAF, AFRC, ANG, and DoD sites. AS241 itself carries no currently active public routing [Confirmed for handle/operator; Likely for the broader AFSN portfolio per third-party DB] — ipinfo.io/AS241, networksdb.io (Air Force Systems Networking)

Analyst note

Encountered as a dormant, low-numbered ASN registered to a U.S. Air Force network unit; WHOIS/RDAP resolves to Air Force Systems Networking, but the ASN has zero public BGP visibility, consistent with a closed/internal DoD network or a fully dormant allocation. Clean, inactive ASN.