AS334

AS334 is a legacy autonomous system number registered under ARIN to the United States Department of Defense, held within the DoD-reserved ASN block DNIC-ASBLK-00306-00371 (covering AS306 through AS371). The ARIN RDAP autnum query for AS334 resolves to this block-level record because these early DoD ASNs were allocated as one contiguous range; its top-level registration event dates to 1989-06-30, with the record last changed 2025-09-12. Operational management sits with the Defense Information Systems Agency (DISA) out of Columbus, Ohio, whose hostmaster (disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil) is the ARIN abuse and technical contact. AS334 is a stub (single-homed) autonomous system: its sole observed neighbour and upstream is AS306, another DoD ASN, indicating closed, intra-DoD routing with no transit offered to third parties and no public peering. It has no PeeringDB profile. The address space it announces lives entirely within 55.72.0.0/16 — DoD-held IPv4 that is non-routable on the public Internet by convention (bgp.he.net flags AS334 as announcing bogons) but legitimately used inside DoD infrastructure — plus one IPv6 block, 2608:12b:2600::/40. In the 2026-06-14 to 2026-06-26 observation window RIPEstat recorded roughly 46 IPv4 prefixes and 1 IPv6 prefix, but as of 2026-06-28 the ASN is not currently announced (as-overview announced=false; prefixes last seen 2026-06-26). It carries no RPKI ROAs. No notable public abuse signal was found as of 2026-06-28: AS334 is absent from the Spamhaus ASN-DROP list, surfaces in no NANOG abuse threads, and draws no threat-feed reports — consistent with a restricted, non-commercial government network. Scamalytics rates the associated IP space low risk.

Operator

United States Department of Defense (DoD), managed by the DoD Network Information Center (DNIC) via DISA-Columbus; ARIN org handle USDDD [Confirmed] — ARIN RDAP autnum/334, ipinfo.io/AS334, ip2location.com/as334

Country / RIR

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

Allocated

1989-06-30 (ARIN RDAP autnum top-level registration event for block DNIC-ASBLK-00306-00371; a first-party RIR date, NOT an IEEE date); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum/334 top-level events (confirmed by angles A2 and A3)

Org status

U.S. federal government agency (Department of Defense); ARIN org USDDD, 3990 E. Broad Street, Columbus, OH 43218; physical presence DISA-Columbus, Whitehall/Columbus, OH [Confirmed] — rdap.arin.net/registry/autnum/334

Contacts

disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (ARIN abuse/technical); domain nic.mil for NOC; DISA (disa.mil) is the operational arm [Confirmed for abuse via RIPEstat; Likely for website/NOC mapping]

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-28 — absent from Spamhaus ASN-DROP (425-entry list checked, AS334 not present), no NANOG abuse threads, no threat-feed reports; Scamalytics rates the IP space low risk

Network & routing

Network type

U.S. government / military; stub AS (single-homed, no transit to third parties) [Confirmed] — bgp.he.net/AS334, ipinfo.io/AS334

Size

~46 IPv4 prefixes + 1 IPv6 prefix observed 2026-06-14 to 2026-06-26, all within 55.72.0.0/16 (IPv4) and 2608:12b:2600::/40 (IPv6); NOT currently announced as of 2026-06-28 (last seen 2026-06-26) [Confirmed] — RIPEstat announced-prefixes / as-overview / routing-status

Routing/peering

stub — sole observed neighbour and upstream is AS306 (DoD); no PeeringDB entry; no public peering policy; intra-DoD routing only [Confirmed] — bgp.he.net/AS334, bgp.tools/as/334, peeringdb (404 — not registered)

RPKI

no ROAs documented; bgp.he.net shows no RPKI-valid or RPKI-invalid origins; RIPEstat rpki-validation skipped (no prefix supplied) [Confirmed] — bgp.he.net/AS334

Routing history

first seen 2008-09-23 (55.72.0.0/16); last seen 2026-06-26 (55.72.222.0/24); RIS visibility v4 ~324/326, v6 324/324 when active [Confirmed] — RIPEstat routing-status

Notable usage

carries DoD military IP space, primarily 55.72.0.0/16 (associated with U.S. Army Information Systems Command / USAISC) [Confirmed] — bgp.he.net/AS334, rdap.arin.net/registry/autnum/334

Related ASNs

AS306 (DoD; sole upstream/neighbour and parent block ASN); block DNIC-ASBLK-00306-00371 spans AS306–AS371 [Confirmed] — bgp.he.net/AS334, rdap.arin.net/registry/autnum/334

Bogon note

bgp.he.net flags AS334 as announcing bogons — 55.x.x.x is IANA-assigned to DoD but non-routable on the public Internet by convention, routed internally within DoD networks [Likely] — bgp.he.net/AS334

Analyst note

A1 canonical-JSON RDAP fetch timed out, but A2 and A3 independently confirmed the autnum top-level registration date (1989-06-30) and holder from ARIN RDAP; as_rank and customer_cone were not reported by any source (stub ASN, no downstream customers) and stay Unknown/null.