AS329

AS329 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD) and administered by the Defense Information Systems Agency (DISA) through the DoD Network Information Center (DNIC). It does not have its own per-ASN RDAP record: ARIN's RDAP endpoint for autnum 329 returns the block object DNIC-ASBLK-00306-00371 (handle AS306, startAutnum 306, endAutnum 371), a contiguous range of ASNs reserved for DoD use. The block carries a top-level ARIN registration event of 1989-06-30, which is the authoritative first-party RIR allocation date for AS329, with a last-changed event of 2025-09-12. Registrant is "United States Department of Defense (DoD)" (ARIN handle USDDD) at 3990 E. Broad Street, Columbus, OH 43218, with NOC, technical, and abuse contacts at DISA-Columbus (disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil, +1-844-347-2457). On the routing side, AS329 originates DoD-reserved address space — about a dozen IPv4 prefixes drawn mostly from the 55.x.x.x range plus 215.65.80.0/24, and one IPv6 prefix, 2608:16a:5900::/40. RIPEstat reported the ASN as not currently announced at the 2026-06-28 query time, with its last active prefixes timing out 2026-06-26; first observed routing dates to 2008-05-20. Its only observed BGP neighbours are other DoD networks (AS306, AS1733), consistent with an internal/enclave government posture rather than a commercially peered network. No notable public abuse signal was found as of June 2026 — AS329 is absent from Spamhaus ASN-DROP, shows a 0.00% spam rate at CleanTalk, and has no NANOG or threat-feed mentions. The only routing-hygiene observations are an absence of RPKI ROAs and a possible legacy bogon flag on 215.65.80.0/24 that does not appear in Hurricane Electric's live bogon report.

Operator

United States Department of Defense (DoD), administered by DISA / DoD Network Information Center (DNIC) [Confirmed] — ARIN RDAP (registrant USDDD), bgp.tools/as/329

Country / RIR

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

Allocated

1989-06-30 (ARIN registry top-level registration event for block DNIC-ASBLK-00306-00371 that contains AS329 — a first-party RIR fact); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum top-level events

Org status

active U.S. federal government agency; registrant United States Department of Defense (DoD), ARIN handle USDDD, Columbus OH; NOC/technical at DISA-Columbus [Confirmed] — ARIN RDAP

Contacts

disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil; +1-844-347-2457; DISA-Columbus, 300 North James Road, Whitehall, OH 43213; registrant 3990 E. Broad Street, Columbus, OH 43218 [Confirmed] — ARIN RDAP, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-28 — absent from Spamhaus ASN-DROP, 0.00% spam at CleanTalk (17 IPs), no SANS ISC reports, no NANOG threads; a possible bogon flag on 215.65.80.0/24 at bgp.he.net is NOT in the live HE bogon report

Network & routing

Network type

U.S. federal government / military network; part of the historic DoD ASN block (AS306–AS371) [Confirmed] — ARIN RDAP, bgp.tools/as/329

Size

~12 IPv4 prefixes (mostly 55.x.x.x plus 215.65.80.0/24) and 1 IPv6 prefix (2608:16a:5900::/40); IPv4 estimate ~131,840 addresses dominated by two /16s (55.78.0.0/16, 55.92.0.0/16) [Likely] — RIPEstat announced-prefixes, ipinfo.io/AS329

Routing/peering

NOT currently announced as of 2026-06-28 (last active prefixes ended 2026-06-26); first seen 2008-05-20; only observed neighbours are AS306 and AS1733, both DoD networks; no PeeringDB-style open peering policy published for AS329 [Confirmed for announce-status/neighbours via RIPEstat] — stat.ripe.net routing-status / as-overview, bgp.tools/as/329

RPKI

no ROAs registered for AS329 (zero RPKI-valid prefixes); not assessable per-prefix in this fetch (RIPEstat rpki-validation needs a prefix) — routing-hygiene gap, not an abuse signal [Likely] — bgp.he.net/AS329

Notable usage

originates DoD-reserved IP space (55.x.x.x, 215.65.80.0/24, 2608:16a:5900::/40); upstreams/peers are exclusively other DoD ASNs, indicating an internal/enclave government network rather than a publicly carried one [Likely] — bgp.tools/as/329, RIPEstat announced-prefixes

Related ASNs

AS306 and AS1733 (both DoD networks; observed BGP neighbours / block siblings of AS329) [Confirmed] — ARIN RDAP, bgp.tools/as/329

Block handle

DNIC-ASBLK-00306-00371 (handle AS306; startAutnum 306, endAutnum 371) — AS329 has no separate per-ASN RDAP record; the block object covers it [Confirmed] — ARIN RDAP

Analyst note

Encountered as a DoD ASN within the DNIC block AS306–371; ARIN RDAP for autnum 329 resolves to the block record, not a standalone AS329 object. Went dark ~2 days before the 2026-06-28 query. Clean, restricted government network.