AS319

AS319 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD). It is not a standalone RDAP object: it falls inside the ARIN autnum block DNIC-ASBLK-00306-00371, which spans AS306 through AS371 and is held under the DoD organization handle USDDD. The block is administered by the Defense Information Systems Agency (DISA) — the DoD combat support agency that operates the DoD Network Information Center (DNIC) — with registry contacts maintained from DISA-Columbus in Whitehall/Columbus, Ohio. The block's ARIN registration event dates to 1989-06-30, placing AS319 among the early Internet-era ASNs, and the record was last changed on 2025-09-12. Routing-wise, AS319 behaves as a closed internal DoD stub: when announced, it originates eight IPv4 prefixes that all nest under 55.26.0.0/16 (roughly 65,536 addresses, attributed to Headquarters USAISC, the U.S. Army Information Systems Command) plus one IPv6 prefix, 2608:14b:2900::/40. RIPEstat reported announced:false as of 2026-06-28, with those prefixes last visible in the 2026-06-14 to 2026-06-26 window, indicating a very recent withdrawal. The only routing-integrity annotation is bgp.he.net's bogon flag on the IPv6 prefix — a pattern common to DoD stub ASNs and consistent with internally-routed, non-globally-allocated space rather than malicious routing. No notable public abuse signal was found as of 2026-06-28: AS319 is absent from the Spamhaus ASN-DROP feed, has no NANOG abuse threads, and surfaced no hijacking or malware campaign reports in open sources.

Operator

United States Department of Defense (DoD), administered by DISA / DoD Network Information Center (DNIC); ARIN org handle USDDD [Confirmed] — ARIN RDAP autnum/319, ipinfo.io/AS319

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP (block DNIC-ASBLK-00306-00371), RIPEstat as-overview

Allocated

1989-06-30 (ARIN registry date for block AS306–AS371, the authoritative first-party RIR registration event applicable to AS319; ARIN exposes no separate per-ASN date for individual block members); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum top-level events

Org status

active U.S. Department of Defense combat support agency (DISA); block record last updated 2025-09-12 per ARIN RDAP [Confirmed] — ARIN RDAP, en.wikipedia.org/wiki/Defense_Information_Systems_Agency

Contacts

Network DoD (MIL-HSTMST-ARIN) disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil, +1-844-347-2457 ext 2; Registration disa.columbus.ns.mbx.arin-registrations@mail.mil; DISA-Columbus, 3990 E. Broad Street / 300 North James Road, Whitehall/Columbus, OH 43218, United States

[Confirmed] — ARIN RDAP autnum/319

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal as of 2026-06-28 — not in Spamhaus ASN-DROP, no NANOG abuse threads, no public hijacking/malware/phishing reports. ThreatFox has an AS319 page but it was CAPTCHA-blocked (Unknown). Scamalytics characterizes DoD NIC as low fraud risk (snippet only; 403-blocked) [Confirmed for Spamhaus/NANOG absence; Likely for Scamalytics] — spamhaus.org/drop/asndrop.json, seclists.org/nanog, bgp.he.net/AS319

Network & routing

Network type

U.S. federal government / military — DoD internal network; classified as a stub AS (single-homed, no transit). Prefixes serve Headquarters USAISC (U.S. Army Information Systems Command) [Confirmed] — ipinfo.io/AS319, bgp.he.net/AS319, networksdb.io/ip-addresses-of/headquarters-usaisc

Size

8 IPv4 prefixes (~65,536 addresses; all subnets of or equal to 55.26.0.0/16) + 1 IPv6 prefix; RIPEstat shows announced:false as of 2026-06-28, prefixes last seen 2026-06-14 to 2026-06-26 [Confirmed] — RIPEstat announced-prefixes/as-overview (resource=319)

Routing/peering

closed internal DoD stub; peers and upstream are AS306 (also DoD) only — internal DoD peering, no downstream ASNs. No PeeringDB profile for AS319; no public peering policy [Confirmed for AS306 peering via ipinfo/bgp.he.net] — ipinfo.io/AS319, bgp.he.net/AS319

RPKI

not assessable from this fetch — RIPEstat RPKI validator was skipped (no prefix supplied); per-prefix ROA status not confirmed [Unknown]

Notable usage

hosts 55.26.0.0/16 and sub-prefixes attributed to Headquarters USAISC. bgp.he.net flags AS319 as announcing a bogon, specifically the IPv6 prefix 2608:14b:2900::/40 (a BGP/data artifact common to DoD stub ASNs, not an operator policy or malicious signal)

[Likely] — bgp.he.net/AS319, bgpfilterguide.nlnog.net/guides/bogon_prefixes

Related ASNs

AS306 (DoD, AS319's sole peer/upstream); the full block DNIC-ASBLK-00306-00371 covers AS306–AS371, all DoD [Confirmed] — ARIN RDAP autnum/319

Analyst note

AS319 has no standalone RDAP autnum record — it inherits the block record DNIC-ASBLK-00306-00371 (AS306–AS371). The 1989-06-30 date is the block-level ARIN registration event (first-party RIR fact), recorded as allocated_date. The IPv6 bogon flag is a routing-table artifact, not an abuse signal. Clean, low-visibility DoD stub ASN.