AS318

AS318 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD), administered by the DoD Network Information Center (DNIC) through the Defense Information Systems Agency (DISA) at its Columbus, Ohio facility. It is not an individually delegated ASN: it is one member of the contiguous block DNIC-ASBLK-00306-00371, which covers AS306 through AS371 (66 consecutive ASNs) and resolves identically to the DoD across every consulted source. The block's authoritative ARIN RDAP autnum top-level registration event is dated 1989-06-30, with a last-changed date of 2025-09-12 — a current, maintained registration. The key triage point for AS318 is that it is operationally dormant in the public Internet: RIPEstat reports it is not announced (0 of 326 IPv4 RIS peers and 0 of 323 IPv6 RIS peers see it), it originates zero IPv4 and zero IPv6 prefixes, has zero observed BGP neighbours, and is invisible in the global default-free zone as of 2026-06-28. RPKI posture is therefore not assessable — with no announced prefixes there are no ROAs to validate. CAIDA AS Rank data was unavailable at query time (HTTP 502), so customer-cone and ranking metrics are recorded as Unknown rather than guessed. No notable public abuse signal was found — AS318 is absent from the Spamhaus ASN-DROP list and returned no AbuseIPDB/FraudGuard records and no NANOG or BGP-incident hits — consistent with a long-registered but presently unannounced U.S. government ASN.

Operator

United States Department of Defense (DoD), administered by the DoD Network Information Center (DNIC) / DISA Columbus; ARIN registrant org handle USDDD [Confirmed] — ARIN RDAP autnum/318, bgp.he.net/AS318

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin), ARIN RDAP autnum/318

Allocated

1989-06-30 (ARIN RDAP autnum top-level registration event for the block DNIC-ASBLK-00306-00371 covering AS318 — a first-party RIR fact); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum/318 top-level events

Org status

active organization (DoD/DISA), inactive ASN — block registration is current (last changed 2025-09-12) but AS318 itself carries no routed prefixes [Confirmed] — ARIN RDAP autnum/318, ipinfo.io/AS318

Contacts

abuse/hostmaster disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil, +1-844-347-2457 ext 2 (MIL-HSTMST-ARIN); registrations disa.columbus.ns.mbx.arin-registrations@mail.mil (REGIS10-ARIN); DISA-Columbus, 300 North James Road, Whitehall, OH 43213, US

[Confirmed] — ARIN RDAP autnum/318, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-28 — NOT in Spamhaus ASN-DROP; no AbuseIPDB/FraudGuard records (HTTP 404); no NANOG threads or BGP-incident records; absence consistent with an inactive ASN carrying no routed IPs

Network & routing

Network type

U.S. Federal Government / Military (DoD) network; AS318 is legacy and currently unannounced (no public BGP presence) [Confirmed] — bgp.he.net/AS318, ipinfo.io/AS318

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes announced by AS318 itself [Confirmed] — RIPEstat routing-status / announced-prefixes / as-overview (2026-06-28)

Routing/peering

NOT announced — 0 RIS peers seeing it (0/326 v4, 0/323 v6); 0 observed neighbours; no upstreams or peers visible in any source [Confirmed]. No PeeringDB entry for AS318 (HTTP 404) [Confirmed — Unknown peering policy]

RPKI

not assessable — AS318 announces no prefixes, so there are no ROAs to validate (RIPEstat rpki-validation requires a prefix) [Confirmed] — RIPEstat rpki-validation

Notable usage

AS318 is one of 66 ASNs in the DoD block DNIC-ASBLK-00306-00371 (AS306–AS371), reserved for U.S. Department of Defense use since 1989. It originates no public prefixes and is not visible in the global routing table — consistent with DoD practice of holding early ASN block members for internal or non-public network segments [Confirmed for block membership; Likely for usage rationale] — ARIN RDAP autnum/318, bgp.he.net/AS318

Related ASNs

AS306–AS371 — the full DNIC-ASBLK-00306-00371 block, all attributed identically to the DoD Network Information Center [Confirmed] — ARIN RDAP autnum/318 (startAutnum 306 / endAutnum 371)

Analyst note

Encountered as a dormant legacy ASN within a DoD block; AS318 has no individual ARIN record separate from its block entry. Entity-level registration dates (MIL-HSTMST 1993-05-26, REGIS10 2009-06-24, USDDD org 2007-01-12) are contact/org dates, NOT the ASN allocation — the autnum top-level 1989-06-30 is authoritative. Clean, inactive ASN.