AS739

AS739 is a dormant U.S. Air Force autonomous system registered to Air Force Systems Networking under ARIN, and it has not announced any prefixes in the global routing table since November 2016.

The ASN sits inside ARIN's AS727–AS746 block registration, RDAP handle AFCONC-BLOCK2-AS, held by Air Force Systems Networking (RDAP entity 7ESG) at Maxwell AFB, Gunter Annex, Alabama. Administrative and abuse contact duties are handled by DISA-Columbus, a Defense Information Systems Agency office, rather than the Air Force unit directly.

Every routing source checked — RIPEstat, CAIDA AS Rank, bgp.he.net, and bgp.tools — agrees AS739 currently announces zero IPv4 and zero IPv6 prefixes, with zero visible peers, upstreams, or customers. Its CAIDA rank of 79,459 and singleton customer cone (itself only, 0 prefixes) reflect complete routing inactivity. The last known origination was 128.26.29.0/24, last seen between 2016-11-01 and 2016-11-04 depending on source.

The RIR allocation date could not be confirmed with certainty: the autnum's top-level RDAP events array carries only a single "last changed" entry (2008-06-06), with no top-level "registration" event to read. Nearby entity-level dates (2008-06-05 for the registrant organization, 2009-06-24 for the admin contact) belong to linked contact objects, not the autnum resource itself, so they are not used as the allocation date.

Operator

Air Force Systems Networking (RDAP entity 7ESG; U.S. Air Force / DoD network; ARIN block AS727-AS746 "AFCONC-BLOCK2-AS"; Maxwell AFB, Gunter Annex, AL) [Confirmed] — ARIN RDAP autnum/739

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder, ARIN RDAP

Allocated

Unknown — the autnum's top-level RDAP events[] array carries only one "last changed" event (2008-06-06); there is no top-level "registration" eventAction to read an allocation date from. Nearby entity-level dates (registrant org 2008-06-05; admin contact REGIS10-ARIN 2009-06-24) are not used, as they belong to linked contact objects, not the autnum resource

[Confirmed absence] — ARIN RDAP autnum/739

Org status

ARIN registration status active; operationally dormant/unrouted since 2016-11-01 [Confirmed] — ARIN RDAP, bgp.he.net, ipinfo.io

Contacts

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

Website

Unknown / none published — no website field in the ARIN record; no PeeringDB net entry exists for AS739 though sibling ASNs under the same org do [Unknown] — peeringdb.com/org/20118

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-27 — not on the live-checked Spamhaus ASN-DROP list, no NANOG or general-web abuse/hijack reporting; one uncorroborated historical bogon-prefix flag on bgp.he.net for 128.26.29.0/24

Network & routing

Network type

U.S. Air Force / DoD government enterprise network; currently unrouted/dormant, not a commercial ISP [Likely] — solutions71.com AFSN program page (secondary corroboration; the primary .af.mil source returned HTTP 403/bot-blocked)

Size

dormant — 0 IPv4 / 0 IPv6 prefixes and 0 addresses currently announced; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — RIPEstat, CAIDA AS Rank, bgp.he.net, bgp.tools (2026-07)

Routing/peering

NOT announced since 2016-11-01/04 (few days' discrepancy between sources); 0 of 329 v4 / 0 of 324 v6 RIS peers see it; CAIDA degree 0 customer/peer/provider; no PeeringDB net record exists for AS739 [Confirmed]. One historical on-file peer, AS27138 (US DoD), predates the 2016 withdrawal from the routing table [Likely]

RPKI

not assessable — the ASN is unrouted; RIPEstat's rpki-validation endpoint requires a specific prefix, none was supplied for this ASN-level query [Unknown]

Notable usage

historically part of USAF enterprise networking infrastructure; last originated a single /24 (128.26.29.0/24) before going dark in November 2016 [Confirmed] — bgp.he.net, CAIDA AS Rank

Related ASNs

part of the ARIN AS727-AS746 block registration (AFCONC-BLOCK2-AS) [Confirmed] — ARIN RDAP autnum/739

Analyst note

Encountered as a dormant DoD/Air Force ASN. The RDAP record is a block registration (AS727-746), not an AS739-specific record, and its top-level events array carries no registration action — only a 2008-06-06 "last changed" entry — so allocated_date is honestly Unknown rather than borrowed from nearby entity-level contact dates.