AS344

AS344 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD), organization handle USDDD, and administered operationally by the Defense Information Systems Agency (DISA) at DISA-Columbus, Whitehall, Ohio. It is one ASN inside the contiguous DoD block DNIC-ASBLK-00306-00371, which spans AS306 through AS371; ARIN RDAP returns the block-level autnum record (handle AS306) for any query within that range, so the per-ASN registrant detail visible in IP-geolocation sources is the historical label "Headquarters USAISC" (U.S. Army Information Systems Command), once headquartered at Fort Huachuca, Arizona. USAISC was inactivated in 1996 and its functions passed to successor commands and eventually NETCOM. The block's ARIN autnum top-level registration event is 1989-06-30, the first-party RIR allocation fact. AS344 is operationally active: RIPEstat announced-prefixes shows roughly 185 IPv4 /24s drawn predominantly from 55.2.0.0/16 plus a small slice of 214.25.0.0/16, and one IPv6 prefix, 2608:18a:1000::/40, with timelines through late June 2026. Peering is exclusively internal DoD — observed adjacencies are AS306 and AS27064 (DoD Network Information Center), with no downstream customers and no public PeeringDB record. The abuse contact routes to DISA's NIC hostmaster. No notable public abuse signal was found as of June 2026: AS344 does not appear in Spamhaus ASN-DROP, UCEPROTECT top-offender lists, or NANOG abuse threads, consistent with a clean U.S. government/military network.

Operator

United States Department of Defense (DoD); ARIN org handle USDDD; administered by DISA (Defense Information Systems Agency), DISA-Columbus, 300 North James Road, Whitehall, OH 43213 [Confirmed] — ARIN RDAP autnum/344 registrant + admin entities

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/344; RIPEstat abuse-contact-finder (authoritative_rir: arin)

Allocated

1989-06-30 (ARIN autnum TOP-LEVEL registration event for the DNIC block DNIC-ASBLK-00306-00371 covering AS344 — first-party RIR registry fact, NOT an IEEE date); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum top-level events

Org status

active U.S. federal government entity; registrant United States Department of Defense (DoD), org handle USDDD; operationally administered by DISA-Columbus [Confirmed] — ARIN RDAP autnum/344

Contacts

NOC/hostmaster handle MIL-HSTMST-ARIN, "Network DoD"; abuse/hostmaster email disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil; phone +1-844-347-2457 ext. 2; address DISA-Columbus, 300 North James Road, Whitehall, OH 43213 [Confirmed] — ARIN RDAP autnum/344; 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, UCEPROTECT top-offender lists, or NANOG abuse archives; the only routing artifact is a transient March-2020 RIS peer-visibility dip (not a hijack/leak indicator) [Confirmed for blocklist absence; Likely for the routing-history reading] — spamhaus.org/drop/asndrop.json, uceprotect.net, RIPEstat routing-history

Network & routing

Network type

U.S. military / government internal-routing network (not a commercial ISP or transit provider); IP2Location usage type "Military (MIL)" [Confirmed] — ipinfo.io/AS344, bgp.he.net/AS344, ip2location.com

Size / prefixes

~185 IPv4 /24-equivalents predominantly from 55.2.0.0/16 (e.g. 55.2.49.0/24, 55.2.88.0/22, 55.2.224.0/22) plus a small block in 214.25.0.0/16; one IPv6 prefix 2608:18a:1000::/40; address estimate roughly 45k–48k IPv4 addresses [Confirmed for prefix space; Likely for the address-count estimate] — RIPEstat announced-prefixes

Routing / peering

closed internal DoD model — observed peers/upstreams are AS306 (DoD) and AS27064 (DoD Network Information Center); zero downstream customers; no PeeringDB record (HTTP 404); no public peering policy document [Likely] — bgp.he.net/AS344, ipinfo.io/AS344

RPKI

not assessed — RPKI validation requires per-prefix ROA checks across the ~185 announced prefixes; no per-prefix validation was run [Unknown]

AS rank / customer cone

not extracted — no CAIDA AS-rank or downstream-cone data captured [Unknown]

Notable usage

historical per-ASN operator label is "Headquarters USAISC" (U.S. Army Information Systems Command), Fort Huachuca, AZ; USAISC inactivated 1996, functions transferred to successor commands and later NETCOM (Army Network Enterprise Technology Command, est. 2002)

[Confirmed for label/history] — ip2location.com, en.wikipedia.org/wiki/Army_Network_Enterprise_Technology_Command

Block / network name

DNIC-ASBLK-00306-00371, spanning AS306–AS371 (startAutnum 306, endAutnum 371); ARIN returns the block record (handle AS306) for AS344 [Confirmed] — ARIN RDAP autnum/344

Status

active [Confirmed] — ARIN RDAP autnum/344 status; RIPEstat announced-prefixes timelines through 2026-06-26

Analyst note

AS344 is a single ASN inside a contiguous DoD ARIN block; RDAP resolves to the block record (AS306) rather than a per-ASN object. allocated_date is the block's first-party autnum top-level registration event (1989-06-30); a third-party scrape suggesting 1996 is a database artifact and is NOT used. Clean, active military network.