AS136

AS136 is a legacy two-digit Autonomous System Number registered through ARIN to Air Force Systems Networking (ARIN organization handle 7ESG), a networking office of the United States Air Force. The ARIN autnum carries the AS name AF-ASN-136 and a registration date of 1987-11-03, placing it among the earliest ARIN-era allocations, with the autnum record last changed 2009-02-12. The registrant organization is listed at 501 East Moore Dr., Bldg 884 Rm 1100, Gunther Annex, Maxwell AFB, Alabama, and the administrative, technical, and abuse contacts all resolve to DISA-Columbus (the Defense Information Systems Agency office at 300 North James Road, Whitehall, Ohio; disa.columbus.ns.mbx.arin-registrations@mail.mil), the same DISA-administered contact pattern seen across the Air Force Systems Networking ASN family. The key triage point is that AS136 is operationally dark: it announces no IPv4 or IPv6 prefixes, has zero observed BGP peers, upstreams, or IXP memberships, and is seen by none of RIPEstat's roughly 326 IPv4 and 319 IPv6 RIS peers. Unlike some sibling ASNs that were withdrawn after a documented routing history, AS136 has no announced prefixes recorded in the RIS-observable window at all (routing-status first-seen and last-seen are both empty), so it is best described as registry-active but never-routed rather than recently withdrawn — no withdrawal date is asserted. CAIDA ranks it 79,459 with a customer cone of just itself and an AS degree of zero, and no RPKI records exist (nothing is announced to validate). No notable public abuse signal was found as of June 2026 — a clean, dormant U.S. military legacy ASN. One caution for triage: the 754th Electronic Systems Group is sometimes associated with this number, but that unit maps to AS385, not AS136; the authoritative ARIN registrant for AS136 is Air Force Systems Networking.

Operator

Air Force Systems Networking (ARIN org handle 7ESG; administered via DISA-Columbus) [Confirmed] — ARIN RDAP (rdap.arin.net/registry/autnum/136)

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP; CAIDA country.iso=US

Allocated

ARIN autnum RegDate 1987-11-03 (ARIN database registration date — NOT an IEEE attribution); autnum last changed 2009-02-12 (registry values; original assignment not separately exposed) [Confirmed for shown dates] — ARIN RDAP

Org status

active ARIN registration (autnum last changed 2009-02-12) under Air Force Systems Networking (7ESG); registrant at Gunther Annex, Maxwell AFB, AL 36114; operational/abuse contact DISA-Columbus, Whitehall, OH 43213. ASN itself operationally inactive [Confirmed] — ARIN RDAP

Website

no dedicated AS136 site; closest official presence is af.mil; ARIN contact domain mail.mil [Likely] — A2 operator angle (no standalone AFSN site found)

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-13; absent from Spamhaus ASN-DROP (2026-05-29 revision); no NANOG threads surfaced; no BGP hijack/route-leak records found. Null findings from web-search archives are not exhaustive — government/military networks rarely appear in commercial abuse feeds

Network & routing

Network type

U.S. federal government / military (enterprise/government), legacy and currently dormant [Confirmed] — ARIN RDAP; bgp.he.net/AS136

Size

0 IPv4 and 0 IPv6 prefixes announced; 0 address space; RIPEstat sees AS136 at 0/326 v4 and 0/319 v6 RIS peers [Confirmed] — bgp.he.net/AS136, RIPEstat routing-status, stat.ripe.net/data/announced-prefixes (2026-06)

Routing/peering

not in the global BGP table; no prefixes ever observed in the RIS window (routing-status first_seen/last_seen both empty; announced-prefixes empty) — best described as never-routed, NOT a recent withdrawal (no withdrawal date asserted); 0 upstreams, 0 peers, 0 observed neighbours

[Confirmed] — RIPEstat routing-status, bgp.he.net/AS136, CAIDA AS-rank

RPKI

Unknown — RPKI validation skipped (no prefix supplied); with 0 active announcements there are no ROAs to validate against [Likely] — RIPEstat rpki-validation (skipped), bgp.he.net/AS136

CAIDA

AS-rank 79,459; customer cone = 1 ASN / 0 prefixes / 0 addresses (self only); asnDegree total/customer/peer/provider all 0; cliqueMember false; seen false; IXP membership none (ixp null) [Confirmed] — CAIDA AS-rank API (api.asrank.caida.org)

Notable usage

early ARIN-era ASN (registered 1987-11-03) in the U.S. Air Force Systems Networking family; presently dormant with no active routes and no recorded routing history — networksdb.io (Air Force Systems Networking), bgp.he.net/AS136

Related ASNs

AS132 (WPAFB-CSD-NET-AS, same Air Force Systems Networking operator) and the broader U.S. Air Force ASN family; AS385 is the separate 754th Electronic Systems Group ASN sometimes mis-associated with this number [Confirmed for AS132/AS385 identities] — bgp.he.net/AS385, ARIN RDAP

Contact

abuse/administrative/technical via DISA-Columbus disa.columbus.ns.mbx.arin-registrations@mail.mil; +1-844-347-2457 ext.2 [Confirmed] — ARIN RDAP

Analyst note

A dormant U.S. military legacy ASN under DISA administration; registry-active but with no observed BGP announcements at all (never-routed in the RIS window, not a dated withdrawal), no RPKI, clean abuse profile. The 1987-11-03 date is an ARIN database registration date, not IEEE-attributed. The A5 "754th ESG" attribution belongs to AS385 and is not treated as refutation of the ARIN registrant. An IP "in" AS136 is not currently routed.