AS164

AS164 is a legacy U.S. Department of Defense Autonomous System Number registered under ARIN with the handle DNIC-AS-00164. The registrant of record is the United States Department of Defense (DoD), org handle USDDD, and the number is administered through the Defense Information Systems Agency (DISA) — specifically the DoD Network Information Center (DNIC) operation in Columbus, Ohio. The ARIN registry shows a registration date of 1988-03-23, placing AS164 among the earliest ASNs assigned to U.S. military infrastructure; the ASN record was last changed 2025-09-12 and the organization record 2025-03-13. The key triage point is that AS164 is currently dormant in routing: as of 2026-06-16 it originates 0 IPv4 and 0 IPv6 prefixes, is seen by 0 of 328 RIS peers (v4) and 0 of 322 (v6), and is absent from the global BGP table per RIPEstat, bgp.tools, and Hurricane Electric. CAIDA ranks it 79459 with an AS degree of 0 across customer/peer/provider and a customer cone of just itself (1 ASN, 0 prefixes, 0 addresses). It has no PeeringDB entry (HTTP 404) and no public peering policy. Because it announces no address space it cannot be a conventional source of spam, scanning, or DDoS traffic — and consistent with that, no notable public abuse signal was found as of 2026-06-16 across Spamhaus ASN-DROP, AbuseIPDB, SORBS, CleanTalk, SANS ISC DShield, or NANOG archives. Active DoD/DISA networking runs under other ASNs (e.g., AS27064); the well-known 2021 DoD routing episode involved AS8003 (GRS), not AS164.

Operator

United States Department of Defense (DoD), administered by DISA / DoD Network Information Center (DNIC); ARIN OrgId USDDD, registered address 3990 E. Broad Street, Columbus, OH 43218 [Confirmed] — ARIN RDAP

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/164

Allocated

ARIN ASN RegDate 1988-03-23 (registry record; NOT attributed to IEEE — IEEE publishes no ASN dates); ASN last changed 2025-09-12, org record last changed 2025-03-13 [Confirmed for the shown dates] — ARIN RDAP

Org status

active registrant (U.S. DoD, a federal combat-support context); DISA is the managing body, not a commercial entity. NOC/abuse contact: Network DoD, DISA-Columbus, 300 North James Road, Whitehall, OH 43213; disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil; +1-844-347-2457 ext 2

[Confirmed] — ARIN RDAP

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-16 — not listed in Spamhaus ASN-DROP (feed's lowest entry is ASN 245), AbuseIPDB /as/164 returns 404, SANS ISC DShield tracks DNIC-AS-00164 but with an empty IP table; no BGP hijack/route-leak incident naming AS164 in NANOG archives. The 2021 DoD episode was AS8003 (GRS), not AS164

Network & routing

Network type

U.S. federal government / military DoD internal infrastructure; legacy ASN, currently dormant in global routing [Confirmed] — bgp.tools / bgp.he.net

Size

zero routed footprint — 0 IPv4 prefixes / 0 addresses, 0 IPv6 prefixes; not present in the global BGP table [Confirmed] — RIPEstat / bgp.he.net / bgp.tools (2026-06-16)

Routing/peering

not announced; 0 upstreams, 0 peers (CAIDA asnDegree provider/peer/customer all 0); seen by 0/328 RIS peers v4 and 0/322 v6; RIPEstat first_seen/last_seen empty [Confirmed] — RIPEstat / bgp.he.net

RPKI

not assessable — no announced prefixes against which to verify ROAs; HE reports 0 valid / 0 invalid originations [Confirmed for "no data"; posture Unknown] — bgp.he.net

Notable usage

one of the earliest ASNs assigned to U.S. military infrastructure (1988), tied to the DoD Network Information Center (DNIC) that historically managed DoD IP/ASN allocations; currently dormant. Active DoD/DISA routing uses other ASNs such as AS27064 [Confirmed for dormancy/registrant; AS27064 as active-DoD example Likely] — ARIN RDAP / bgp.tools

Related ASNs

AS27064 (active DoD/DISA networking, example); AS8003 (GRS / Global Resource Systems — the separate 2021 DoD pilot, NOT this ASN) [Likely] — bgp.tools / Kentik

Analyst note

Encountered as a legacy, registry-active but routing-dark DoD ASN. WHOIS resolves to the U.S. Department of Defense via DISA/DNIC. No public routing presence and no abuse signal — effectively a dormant government-held legacy ASN.