AS135

AS135 is one of the earliest Autonomous System Numbers ever allocated, registered through ARIN to the United States Department of Defense (DoD) under organization handle USDDD. The ARIN record carries the AS name DNIC-AS-00135, the "DNIC" prefix marking it as a network historically administered by the DoD Network Information Center — the body that descended from the DDN-NIC and handled IP and ASN assignment for DoD networks through DISA (Defense Information Systems Agency). The technical, NOC, and abuse contacts all resolve to DISA-Columbus in Whitehall, Ohio, with the registrant organization listed at 3990 E. Broad Street, Columbus, OH. Operationally this ASN is dark: it announces zero prefixes today and has not been visible in the global routing table since mid-2012. RIPEstat's routing history records it as first seen on 2008-05-20 (153.23.252.0/22) and last seen on 2012-07-11 (153.24.228.0/23), within the 153.23.0.0/16 and 153.24.0.0/16 space associated with Air Force Systems Networking; Hurricane Electric lists ten originated IPv4 prefixes that are no longer propagated, one of which (207.133.180.0/24) it flags as a bogon. CAIDA ranks it 79459 with a customer cone of just itself (one ASN, zero prefixes, zero addresses) and an AS degree of zero, consistent with a legacy allocation that no longer carries live BGP. No public peering policy or PeeringDB profile exists, and no notable abuse signal was found as of June 2026 — a clean, dormant government-held ASN.

Operator

United States Department of Defense (DoD), administered by the DoD Network Information Center (DNIC) under DISA; ARIN OrgId USDDD [Confirmed] — ARIN RDAP

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP

Allocated

ARIN ASN registration date 1987-10-26 (ARIN database registration date — NOT an IEEE attribution); autnum last changed 2025-09-12 [Confirmed for the shown dates] — ARIN RDAP

Org status

active ARIN registration (autnum last changed 2025-09-12) under USDDD; registrant U.S. DoD at 3990 E. Broad Street, Columbus, OH 43218; operational unit DISA-Columbus, 300 North James Road, Whitehall, OH 43213. ASN itself operationally inactive [Confirmed] — ARIN RDAP

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-13; not in Spamhaus ASN-DROP; no NANOG threads surfaced. 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 network (legacy DoD allocation; address space historically tied to Air Force Systems Networking) [Confirmed] — bgp.he.net

Size

dormant — 0 currently announced prefixes / 0 IPs; HE lists ~10 historically originated IPv4 prefixes (none currently propagated), 1 flagged as bogon (207.133.180.0/24); 0 IPv6 — bgp.he.net / RIPEstat (2026-06)

Routing/peering

NOT in the global BGP table; last seen 2012-07-11. CAIDA AS degree total/peer/provider all 0; 0 observed neighbours (RIPEstat); 0 of 326 v4 and 0 of 319 v6 RIS peers see any route. One historically documented peer: AS27064 (DoD Network Information Center)

[Likely on the single peer] — bgp.he.net / RIPEstat / CAIDA

RPKI

Unknown — RPKI validation skipped (no prefix supplied); HE reports all RPKI metrics at zero, consistent with no current global announcement [Likely] — RIPEstat / bgp.he.net

Notable usage

one of the very earliest allocated ASNs (registered 1987-10-26); served DoD/Air Force Systems Networking space (153.23.0.0/16, 153.24.0.0/16); operationally dark with no routing activity since 2012 — bgp.he.net / ARIN RDAP

Related ASNs

AS27064 (DoD Network Information Center; only ever-observed peer). DoD holds many other low-numbered ASNs (e.g., AS721, AS27065, AS27066) [Confirmed for AS27064] — bgp.he.net / ipinfo.io

Analyst note

Encountered as a legacy DoD allocation that is registered-but-dark; ARIN registration is current and active, but the ASN announces nothing and has been out of the routing table since 2012. The 1987 date is an ARIN database registration date, not an IEEE-attributed value. Distinct from the separate AS8003 DoD-routing event of January 2021.