AS426

AS426 is a legacy autonomous system number registered under ARIN to Air Force Systems Networking (ARIN org handle 7ESG), a U.S. Air Force / Department of Defense network entity based at Maxwell AFB–Gunter Annex, Montgomery, Alabama, with administrative, technical, and abuse contact handled by DISA-Columbus (Defense Information Systems Agency) in Whitehall, Ohio. AS426 does not carry its own discrete RDAP autnum object; an ARIN RDAP query for autnum 426 resolves to the shared block record AFCONC-BLOCK1-AS (handle AS379), which spans AS379–AS508 and was registered on 1989-08-04. AS426 inherits its registrant, contacts, address, top-level registration event, and "active" registry status from that block record. Unlike its actively-routing sibling AS400, AS426 is fully dormant: RIPEstat reports announced:false, an empty announced-prefixes list across the 2000-08-01 to 2026-07-02 window, and 0 of 324 IPv4 / 0 of 320 IPv6 RIS peers seeing it. CAIDA AS Rank places it at 79,459 with a singleton customer cone (1 ASN — itself — 0 prefixes, 0 addresses), an AS degree of 0 (no customers, peers, or providers), no IXP membership, and placeholder 0/0 geo coordinates consistent with an AS that has never been publicly routed and so cannot be geolocated. IPinfo likewise shows zero hosted IPv4/IPv6 addresses and no pingable IPs. No PeeringDB network record exists for AS426 (asn/426 returns 404); the umbrella operator's PeeringDB org record (org/20118) does not list AS426 and publishes no peering policy, and DoD peering is centrally gated via the DISN connection process rather than published per-ASN. No notable public abuse or reputation signal was found as of 2026-07-02 across Spamhaus, NANOG archives, and general threat-intelligence sources — consistent with an unrouted, dormant government block ASN with effectively no live attack surface. RPKI validity could not be assessed because there is no announced prefix to validate against a ROA, and is recorded as Unknown rather than guessed.

Operator

Air Force Systems Networking (ARIN org handle 7ESG; U.S. Air Force / DoD), administered by DISA. Community research associates the block with the 754th Electronic Systems Group at Gunter Annex [Confirmed for org/7ESG via RDAP; Likely for the 754th ELSG attribution] — https://rdap.arin.net/registry/autnum/426, https://airforce.togetherweserved.com/unit/11470/754th-Electronic-Systems-Group

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin), https://rdap.arin.net/registry/autnum/426

Allocated

1989-08-04 (ARIN RDAP autnum TOP-LEVEL registration event on the AFCONC-BLOCK1-AS block record covering AS379–AS508; NOT an IEEE date — IEEE publishes no ASN registration dates); last changed 2008-06-06 [Confirmed] — ARIN RDAP autnum top-level events[]

Org status

active per ARIN RDAP status (block record active); no operator-official (DoD/Air Force) page confirms current operational use of AS426 specifically, and third-party BGP data shows it is currently unrouted/dormant [Confirmed for RDAP status and third-party dormancy; Unknown for operator-official operational confirmation] — https://rdap.arin.net/registry/autnum/426, https://bgp.he.net/AS426

Contacts

DISA-Columbus, 300 North James Road, Whitehall, OH 43213, US — disa.columbus.ns.mbx.arin-registrations@mail.mil, +1-844-347-2457 ext2 (POC handle REGIS10-ARIN); registrant address 501 East Moore Dr., Bldg 884, Rm 1100, Gunter Annex, Maxwell AFB, AL 36114, US

[Confirmed] — https://rdap.arin.net/registry/entity/REGIS10-ARIN, https://rdap.arin.net/registry/autnum/426

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-02 — not in Spamhaus, NANOG archives, or general threat-intelligence/BGP-incident sources; consistent with a dormant, unrouted government network with no live attack surface [Likely — absence-of-evidence, not a certified clean record] — https://ipinfo.io/AS426, https://bgp.he.net/AS426

Network & routing

Network type

U.S. government / military network (DoD, U.S. Air Force), administered by DISA; not a commercial ISP, hosting, content, or transit network [Confirmed] — https://rdap.arin.net/registry/autnum/426

Size

dormant — 0 announced IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes; CAIDA customer cone = 1 ASN (itself), 0 prefixes, 0 addresses; IPinfo shows 0 hosted addresses [Confirmed] — RIPEstat routing-status / announced-prefixes / CAIDA AS Rank / https://ipinfo.io/AS426 (2026-07-02)

Routing/peering

NOT announced — RIPEstat announced:false, empty prefix list (2000-08-01→2026-07-02), 0/324 RIS peers seeing it v4 and 0/320 v6, 0 observed neighbours; CAIDA AS degree total 0 (customer 0, peer 0, provider 0); no upstreams or peers observed in any source

[Confirmed] — RIPEstat routing-status, CAIDA AS Rank

Peering policy

none published; no PeeringDB network record for AS426 (asn/426 → 404); umbrella org record org/20118 lists sibling ASNs but not AS426 and has no peering-policy field; DoD/DISA peering centrally gated via the DISN connection process, not per-ASN

[Confirmed] — https://www.peeringdb.com/asn/426, https://www.peeringdb.com/org/20118

RPKI

not assessable — RIPEstat rpki-validation was skipped (no --prefix supplied); with zero announced prefixes there is no origination and therefore no ROA to validate [Unknown]

AS rank / customer cone

CAIDA AS Rank 79,459; customer cone is a singleton (1 ASN, 0 prefixes, 0 addresses), consistent with an unannounced/dormant AS with no downstream customers [Confirmed] — CAIDA AS Rank data for asn 426

Notable usage

no AS426-specific public-facing service documented on any operator-official page; AS426 is one member of the historical AFCONC-BLOCK1-AS Air Force/DoD block (AS379–AS508) and appears never to have been publicly routed [Confirmed for block membership; Likely for never-routed, based on absence in RIS history] — https://rdap.arin.net/registry/autnum/426, RIPEstat announced-prefixes

Related ASNs

sibling members of the AFCONC-BLOCK1-AS block AS379–AS508 (e.g. AS379, AS385, AS386, AS389–AS391, AS393, AS397, AS398, AS400) [Confirmed for block range] — https://rdap.arin.net/registry/autnum/426

Analyst note

legacy DoD/Air Force block-member ASN. RDAP has no discrete autnum for AS426; identity and the 1989-08-04 registration date come from the parent AFCONC-BLOCK1-AS record (handle AS379, startAutnum 379 / endAutnum 508), which correctly applies to AS426. Entity/POC-level dates (org 7ESG registration 2008-06-05, POC REGIS10-ARIN registration 2009-06-24) were treated as decoys and excluded — allocated_date comes strictly from the autnum top-level events[]. Distinguishing fact vs. actively-routing sibling AS400: AS426 is fully dormant — 0 announced prefixes, 0 peers, 0 cone beyond itself.