AS743

AS743 is a U.S. Air Force/Department of Defense autonomous system, registered under ARIN inside the AFCONC-BLOCK2-AS block (AS727–AS746) and administered through DISA-Columbus, that is currently unannounced in global BGP — zero visible IPv4/IPv6 prefixes, zero RIS peers, and a singleton customer cone.

The block's registrant org is "Air Force Systems Networking" (ARIN handle 7ESG), with registration/abuse/technical contacts routed through DISA-Columbus (Defense Information Systems Agency) in Whitehall, OH, and a registrant address at Maxwell AFB, AL. No independent public-facing operator website, peering-policy page, or PeeringDB network object exists for AS743 specifically — expected for an internal DoD network rather than a commercial operator.

RIPEstat's routing-status history shows one brief origination: the prefix 200.39.24.0/22 with first-seen and last-seen both dated 2026-05-21, a same-day appearance. Outside that event AS743 shows 0 of ~329 RIS v4 peers and 0 of ~324 RIS v6 peers observing it, 0 announced prefixes/addresses, and 0 observed neighbours. CAIDA ASRank corroborates: rank 79,459, "seen": false, zero AS-degree (customer/peer/provider all 0), and a customer cone of just the ASN itself with 0 prefixes and 0 addresses.

The autnum record's TOP-LEVEL RDAP events array carries only one entry — an eventAction of "last changed" dated 2008-06-06 — with no "registration" eventAction present. A separate 2008-06-05 date exists only at the entity level (the 7ESG registrant-org record, not the autnum top level), so per the registration-date rule that date is a decoy and is not used as allocated_date; the top-level events array genuinely carries no registration event, so allocated_date is recorded as Unknown rather than invented.

Operator

Air Force Systems Networking (U.S. Air Force / DoD network; ARIN org handle 7ESG; contacts routed through DISA-Columbus) [Confirmed] — ARIN RDAP autnum/entity records

Country / RIR

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

Allocated

Unknown — the autnum's TOP-LEVEL RDAP events[] array holds only a "last changed" event (2008-06-06), no "registration" event; a 2008-06-05 date exists solely at the entity (registrant-org) level and is excluded as a decoy per the top-level-only rule [Confirmed absence of a top-level registration event] — rdap.arin.net/registry/autnum/727

Org status

active (ARIN RDAP status for the AS727–AS746 block) [Confirmed] — rdap.arin.net/registry/autnum/743

Contacts

disa.columbus.ns.mbx.arin-registrations@mail.mil (REGIS10-ARIN, DISA-Columbus, 300 North James Road, Whitehall, OH 43213); registrant org address 501 East Moore Dr., Bldg 884 Rm 1100, Gunther Annex, Maxwell AFB, AL 36114 [Confirmed] — ARIN RDAP

Security/abuse context (NEUTRAL, INCONCLUSIVE)

no abuse signal confirmed as of 2026-07-27, but Spamhaus check.spamhaus.org returned HTTP 403 and bgpview.io failed DNS resolution, so absence of evidence is not confirmed absence of abuse

Network & routing

Network type

U.S. military/government network (Air Force, administered with DISA); not a commercial or enterprise network [Confirmed] — ARIN RDAP

Size

currently unannounced — 0 IPv4/IPv6 prefixes and addresses; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses; briefly originated 200.39.24.0/22 around 2026-05-21 [Confirmed] — RIPEstat routing-status/announced-prefixes, CAIDA AS Rank (2026-07)

Routing/peering

NOT currently announced — 0/329 RIS v4 peers, 0/324 RIS v6 peers; CAIDA AS-degree total 0 (customer 0, peer 0, provider 0); no PeeringDB network object for AS743 [Confirmed]. A bgp.he.net scrape claiming one BGP peer (AS7438) and Mexico-based prefixes conflicts with ARIN/RIPEstat/CAIDA and is treated as an unreliable third-party artifact [Unknown/discounted]

RPKI

not assessable — no currently announced prefixes to validate a ROA against; RIPEstat's RPKI-validation tool requires a specific prefix [Unknown] — stat.ripe.net

Notable usage

sits inside the AFCONC-BLOCK2-AS block (AS727–AS746) held by Air Force Systems Networking; briefly originated one /22 around 2026-05-21 but is otherwise dormant with no public operator site [Confirmed] — ARIN RDAP, RIPEstat

Related ASNs

AS727 (AFCONC-BLOCK2-AS block designation, spans AS727–AS746) [Confirmed]; AS65, AS123, AS175, AS221, AS301 (siblings under the same PeeringDB org 20118, "Air Force Systems Networking") [Likely]

Analyst note

Encountered as a dormant DoD/Air Force ASN inside a DISA-administered ARIN block; the ARIN autnum's top-level events carry no registration date (only a 2008-06-06 "last changed" event), so allocated_date is honestly recorded as Unknown rather than borrowing the entity-level 2008-06-05 date. The single-day 200.39.24.0/22 announcement on 2026-05-21 is the only routing activity found and is not further explained by any source consulted.