AS738

AS738 is a dormant U.S. Air Force autonomous system, registered under ARIN to Air Force Systems Networking, that currently announces zero IPv4 and zero IPv6 prefixes with no observed BGP peers or upstreams. The ASN falls inside ARIN's AFCONC-BLOCK2-AS registration, a block spanning AS727 through AS746, and its abuse/admin/technical contact routes through DISA-Columbus rather than a standalone network operations team.

The registrant address is 501 East Moore Dr., Bldg 884 Rm 1100, Gunther Annex, Maxwell AFB, Alabama — consistent with U.S. Air Force network infrastructure rather than a commercial or research operator. No dedicated operator website, peering-policy page, or PeeringDB network record exists for AS738 specifically; PeeringDB's organization page for Air Force Systems Networking (org id 20118) lists five other member ASNs (AS65, AS123, AS175, AS221, AS301) but not AS738.

Every routing source consulted agrees the ASN is currently unannounced: RIPEstat shows 0 of 329 IPv4 and 0 of 324 IPv6 RIS peers observing it, CAIDA AS Rank places it at 79,459 with a customer cone of just itself (0 prefixes, 0 addresses) and zero measured upstream, peer, or customer degree, and bgp.he.net independently confirms 0 originated prefixes and 0 observed BGP peers as of 2026-07-27. RPKI posture cannot be assessed because there are no announced prefixes to validate against a ROA.

ARIN's RDAP record lists the containing block's registration status as active, but the autnum object's top-level events array carries only a single "last changed" entry dated 2008-06-06, with no top-level "registration" event — so an original allocation date cannot be confirmed from RDAP. Entity-level dates for the registrant org and POC (2008-06-05, 2009-06-24) are administrative-contact events, not the ASN's allocation date, and were not substituted for it.

Operator

Air Force Systems Networking (US Air Force/DoD; ARIN entity handle 7ESG; registrant address 501 East Moore Dr., Bldg 884 Rm 1100, Gunther Annex, Maxwell AFB, AL 36114); administered via DISA POC group "Registration" (REGIS10-ARIN) [Confirmed] — ARIN RDAP autnum/entity records

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP (rdap.arin.net/registry/autnum/738)

Allocated

Unknown — the autnum top-level events[] array carries only a "last changed" event (2008-06-06); no top-level "registration" event exists to source an allocation date; entity-level dates (org/POC) are decoys and were not substituted [Confirmed absence of a top-level date] — ARIN RDAP autnum

Org status

ARIN RDAP block registration status is "active" — distinct from routing dormancy; the ASN is a live registry record but announces no current routes [Confirmed] — ARIN RDAP

Contacts

disa.columbus.ns.mbx.arin-registrations@mail.mil (REGIS10-ARIN / DISA-Columbus, 300 North James Road, Whitehall, OH 43213; +1-844-347-2457 ext2) [Confirmed] — ARIN RDAP

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-27 — not in Spamhaus ASN-DROP, general web search, or NANOG archives; dormant DoD ASN with little routing surface to observe abuse against

Network & routing

Network type

US military/government AS; falls inside ARIN block AS727–AS746 (AFCONC-BLOCK2-AS), registrant "Air Force Systems Networking" [Confirmed] — ARIN RDAP

Size

dormant — 0 IPv4 prefixes/addresses, 0 IPv6 prefixes; CAIDA customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — RIPEstat routing-status / CAIDA AS Rank / bgp.he.net (2026-07-27)

Routing/peering

NOT announced — 0/329 RIS peers seeing it (v4), 0/324 (v6); CAIDA asnDegree total 0 (customer 0, peer 0, provider 0); no upstreams or peers visible; no PeeringDB net record for AS738 (org 20118 lists AS65, AS123, AS175, AS221, AS301 instead) [Confirmed]

RPKI

not assessable — zero announced prefixes means there is nothing for a ROA to validate against; bgp.he.net shows 0 RPKI-valid and 0 RPKI-invalid origins [Confirmed]

Notable usage

none identified — ipinfo.io reports zero hosted domains and no active IPv4/IPv6 ranges, consistent with an unused/unannounced ASN [Likely] — ipinfo.io/AS738

Related ASNs

AS727–AS746 (the containing ARIN block, AFCONC-BLOCK2-AS); PeeringDB org 20118 (Air Force Systems Networking) separately lists AS65, AS123, AS175, AS221, AS301 as member ASNs, not AS738 [Confirmed] — ARIN RDAP, peeringdb.com/org/20118

Analyst note

Dormant DoD/Air Force ASN inside the AFCONC-BLOCK2-AS block; no live routing across four independent sources, no public abuse signal, and no substitutable allocation date at the top-level RDAP record — nulled honestly rather than backfilled from entity-level contact dates.