AS240

AS240 is a legacy autonomous system number registered under ARIN to Air Force Systems Networking, a unit of the United States Air Force whose registry contact is handled through DISA-Columbus (the Defense Information Systems Agency facility in Whitehall, Ohio). Its ARIN autnum top-level registration date of 1988-09-22 places it among the earliest ASN assignments ever made — predating the commercial Internet — and the network name itself encodes that history: the "SAALC" prefix refers to the former San Antonio Air Logistics Center (SA-ALC) at Kelly AFB, Texas, an Air Force depot closed under the 1995 BRAC round, while "HOSTNET" denotes a host network segment. The key triage point for AS240 is that it is effectively dark today: every routing source consulted (RIPEstat, CAIDA AS Rank) agrees it announces zero IPv4 and zero IPv6 prefixes, is not visible to any RIS peer (0/327 for v4, 0/324 for v6), and has zero upstreams, zero peers, and zero observed neighbours. Its CAIDA AS rank of 79,459 sits near the bottom of the global ranking, reflecting complete routing inactivity, and its customer cone is a singleton (the ASN itself, 0 prefixes, 0 addresses). The only historical routing on record is a single prefix, 209.22.57.0/24, first seen 2004-11-04 and last seen 2004-11-30 — the ASN has been routing-dark for over twenty years. RPKI posture cannot be assessed because there are no active originations and therefore no ROAs. No notable public abuse signal was found as of June 2026 — not in Spamhaus ASN-DROP, NANOG archives, or any threat-feed search — consistent with a clean, dormant ASN held by a tightly managed U.S. military/government operator.

Operator

Air Force Systems Networking (U.S. Air Force unit; ARIN org handle 7ESG; registry contact via DISA-Columbus) [Confirmed] — ARIN RDAP autnum/240, whois.arin.net/rest/asn/AS240

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin), ARIN RDAP

Allocated

1988-09-22 (ARIN autnum top-level registration event, 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 ARIN registrant (handle 7ESG); registrant address 501 East Moore Dr., Bldg 884 Rm 1100, Gunther Annex, Maxwell AFB, AL 36114, United States [Confirmed] — ARIN RDAP, whois.arin.net/rest/asn/AS240

Contacts

disa.columbus.ns.mbx.arin-registrations@mail.mil; admin/tech/abuse via DISA-Columbus, 300 North James Road, Whitehall, OH 43213; tel +1-844-347-2457 ext.2 [Confirmed] — ARIN RDAP, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-20 — not in Spamhaus ASN-DROP, NANOG archives, AbuseIPDB, BGPView, or Hurricane Electric searches; no BGP hijack or route-leak record; dormant ASN under a tightly managed military operator [Likely — web-search surface coverage; no live API lookup] — spamhaus.org/drop/asndrop.txt, seclists.org/nanog

Network & routing

Network type

U.S. Federal Government / Military — Air Force network infrastructure with DISA registry contact; AS240 is legacy/inactive (announces nothing) [Confirmed] — ARIN RDAP, RIPEstat as-overview (announced: false)

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); no upstreams, peers, or observed neighbours in any source [Confirmed]. Only historical route on record: 209.22.57.0/24, first seen 2004-11-04, last seen 2004-11-30

[Confirmed] — RIPEstat routing-status

RPKI

not assessable — AS240 announces no prefixes, so there are no ROAs to validate; RIPEstat rpki-validation skipped (no prefix announced at query time) [Confirmed]

Notable usage

AS240 (SAALC-HOSTNET-AS) is one of the earliest ASN assignments (1988), historically associated with the San Antonio Air Logistics Center at Kelly AFB; it is now inactive with zero prefixes announced. It is one of roughly 270+ ASNs operated under the Air Force Systems Networking ARIN registrant — networksdb.io (Air Force Systems Networking), en.wikipedia.org/wiki/San_Antonio_Air_Logistics_Center

Related ASNs

part of a broad block of ASNs held by the Air Force Systems Networking registrant [Likely per third-party DB] — networksdb.io (Air Force Systems Networking)

Analyst note

Encountered as a dormant legacy ASN (one of the oldest, allocated 1988) registered to a U.S. Air Force entity; WHOIS resolves to Air Force Systems Networking with a DISA contact, but the ASN has announced nothing for over two decades. Clean, inactive, government/military ASN.