AS133

AS133 is an early, low-numbered Autonomous System registered through ARIN to Air Force Systems Networking (ARIN OrgId 7ESG), a U.S. Air Force network-management organization addressed at Gunter Annex, Maxwell AFB, Alabama. ARIN RDAP carries the ASN name AFIT-AS and an original registration date of 1987-10-19, placing it among the first couple hundred AS numbers ever issued; the ASN record was last changed on 2008-08-18. The administrative, technical, and abuse point of contact is DISA-Columbus (Whitehall, Ohio), which is the standard registration handler for U.S. Department of Defense number resources. The important triage point is that AS133 is currently dark: every routing source consulted agrees it announces zero IPv4 and zero IPv6 prefixes, has no observed BGP peers, no upstream providers, and no downstream customers. RIPEstat shows it visible to 0 of 326 IPv4 RIS peers and 0 of 319 IPv6 RIS peers, and CAIDA ranks it 79459 globally with an AS degree of 0 in every dimension and a customer cone containing only itself. Because it originates no prefixes, RPKI posture is not assessable. No notable public abuse signal was found as of 2026-06-13 — it does not appear on the Spamhaus ASN-DROP list, and no NANOG, blacklist, or hijack reports referencing AS133 were located. The "AFIT" label in the ASN name is ambiguous in third-party sources (it may evoke the Air Force Institute of Technology school), but ARIN authoritatively records the registrant as Air Force Systems Networking, not AFIT the academic institution.

Operator

Air Force Systems Networking (U.S. Air Force; ARIN OrgId 7ESG) [Confirmed] — ARIN RDAP (https://rdap.arin.net/registry/autnum/133)

Country / RIR

US, ARIN [Confirmed] — RIPEstat as-overview (block "Assigned by ARIN")

Allocated

ARIN ASN RegDate 1987-10-19; ASN last changed 2008-08-18 [Confirmed] — ARIN RDAP events (https://rdap.arin.net/registry/autnum/133)

Org status

active registrant (Air Force Systems Networking / org 7ESG; org record last changed 2025-03-13); AS133 itself inactive — not routing [Confirmed] — ARIN RDAP; RIPEstat

Contacts

registrant address 501 East Moore Dr., Bldg 884, Rm 1100, Gunter Annex, Maxwell AFB, AL 36114; admin/tech/abuse POC DISA-Columbus, 300 North James Road, Whitehall, OH 43213; abuse email disa.columbus.ns.mbx.arin-registrations@mail.mil [Confirmed] — ARIN RDAP

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-13; not on Spamhaus ASN-DROP; long-dormant DoD ASN — https://www.spamhaus.org/drop/asndrop.json; bgp.he.net/AS133

Network & routing

Network type

U.S. government / military (DoD enterprise networking); legacy ASN, currently non-announcing [Confirmed for holder/status; mission detail Likely] — ARIN RDAP; RIPEstat as-overview

Size

none currently routed — 0 IPv4 prefixes / 0 addresses, 0 IPv6 prefixes; customer cone = 1 ASN / 0 prefixes / 0 addresses — RIPEstat routing-status + CAIDA AS Rank (2026-06-13); corroborated by bgp.he.net/AS133

Routing/peering

not announced in BGP; 0 peers, 0 upstreams, 0 customers; 0/326 RIS peers (v4), 0/319 RIS peers (v6) [Confirmed] — RIPEstat routing-status; CAIDA asnDegree all 0

Notable usage

early low-numbered AS (name AFIT-AS) held by Air Force Systems Networking and managed via DISA-Columbus; historically associated with U.S. Air Force IT/networking infrastructure [Likely] — ARIN RDAP; ipinfo.io/AS133

RPKI

not assessable — AS133 originates no prefixes, so there are no ROAs to validate [Confirmed] — RIPEstat rpki-validation (skipped: no prefix)

Related ASNs

other Air Force Systems Networking allocations under OrgId 7ESG (e.g., AS132) [Likely] — ARIN OrgId 7ESG; bgp.tools cross-references

Analyst note

Encountered as a legacy, non-routing DoD ASN. ARIN resolves the registrant to Air Force Systems Networking (org 7ESG), not the AFIT school despite the AFIT-AS name; first_seen/last_seen BGP history Unknown (RIPEstat empty).