AS339

AS339 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD), held within the contiguous DoD NIC block DNIC-ASBLK-00306-00371 (covering AS306 through AS371). ARIN represents this as a single block record under handle AS306, and an RDAP query for autnum 339 resolves to that parent block — the standard way ARIN exposes DoD ASN ranges. The registrant organization is the DoD under ARIN org handle USDDD, with administrative, technical, and abuse contacts handled by DISA-Columbus (Defense Information Systems Agency), 300 North James Road, Whitehall, OH 43213, via the DoD-NIC hostmaster (disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil, +1-844-347-2457 ext 2). AS339 is a stub AS: single-homed with one observed BGP neighbour (upstream AS306, also DoD) and no transit function, classified as a closed government/military network with no PeeringDB entry and no public peering policy. Within its active routing window it announced four IPv4 prefixes inside 55.83.0.0/16 (a legacy pre-CIDR DoD block) — 55.83.0.0/16, 55.83.4.0/24, 55.83.50.0/24, 55.83.239.0/24 — plus one IPv6 prefix, 2608:12a:4400::/40. Routing was first seen in 2009-10-23 and last seen as recently as 2026-06-26, but RIPEstat reports announced=false as of the 2026-06-28 query, indicating a very recent withdrawal or route flap. IPv4 prefix descriptions attribute 55.83.0.0/16 to "Headquarters, USAISC" (U.S. Army Information Systems Command). RPKI posture could not be assessed (per-prefix validation not run; DoD prefixes historically lacked ROAs). No notable public abuse signal was found as of 2026-06-28: AS339 is absent from Spamhaus ASN-DROP, with no AbuseIPDB, CleanTalk, FraudGuard, or NANOG findings — consistent with a closed DoD network where 0 IPs respond to ICMP. The only flag is a Hurricane Electric "announces bogons" annotation on the AS page, which is not corroborated by HE's live bogon report and is treated as a low-confidence historical artefact.

Operator

United States Department of Defense (DoD); ARIN org handle USDDD [Confirmed] — ARIN RDAP autnum/339, ipinfo.io/AS339, bgp.he.net/AS339

AS name / block

DNIC-ASBLK-00306-00371 (DoD NIC block AS306–AS371; ARIN block handle AS306) [Confirmed] — ARIN RDAP autnum/339, RIPEstat as-overview

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/339; RIPEstat abuse-contact-finder (authoritative_rir: arin)

Allocated

1989-06-30 (ARIN RDAP autnum TOP-LEVEL registration event for the DoD block; entity-level dates such as MIL-HSTMST-ARIN 1993-05-26 are decoys and not used); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum/339 top-level events

Org status

active U.S. federal government / military entity; registrant USDDD (DoD); managed by DISA-Columbus, Whitehall, OH 43213 [Confirmed] — ARIN RDAP autnum/339, ipinfo.io/AS339

Contacts

abuse/NOC/technical disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil, +1-844-347-2457 ext 2; admin DISA-Columbus, 300 North James Road, Whitehall, OH 43213; registrant address 3990 E. Broad Street, Columbus, OH 43218 [Confirmed] — ARIN RDAP autnum/339, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal as of 2026-06-28 — absent from Spamhaus ASN-DROP; nothing on AbuseIPDB/CleanTalk/FraudGuard (404)/NANOG archives; 0 IPs respond to ICMP. HE annotates "announces bogons" but the live HE bogon report does not list AS339 (treated as historical/data-quality artefact) [Confirmed for clean signal; Likely for bogon annotation] — spamhaus.org/drop/asndrop.json, stat.ripe.net bgp-state, bgp.he.net/AS339, bgp.he.net/report/bogons

Network & routing

Network type

government / military stub AS — single-homed, no transit; closed DoD network, classified "Content"/stub by bgp.tools [Confirmed] — ipinfo.io/AS339, bgp.tools/as/339

Routing/peering

1 observed BGP neighbour (upstream AS306, DoD); v4 visibility 324/326 RIS peers and v6 324/324 at last active window; announced=false as of 2026-06-28 (prefixes last seen 2026-06-26) [Confirmed] — RIPEstat routing-status / as-overview

Routing history

first seen 2009-10-23 (55.83.0.0/16); last seen 2026-06-26 (55.83.4.0/24) [Confirmed] — RIPEstat routing-status

RPKI

not assessed — per-prefix RPKI validation not run (requires a prefix argument); no valid/invalid ROAs surfaced by sources consulted [Unknown] — RIPEstat (rpki-validation skipped), bgp.tools/as/339

Notable usage

prefix 55.83.0.0/16 attributed in BGP records to "Headquarters, USAISC" (U.S. Army Information Systems Command); 55.x.x.x is legacy pre-CIDR DoD IPv4 space [Confirmed] — bgp.he.net/AS339, ipinfo.io/AS339

Related ASNs

AS306 (block parent / sole observed upstream, also DoD); entire DNIC block AS306–AS371 is DoD [Confirmed] — ARIN RDAP autnum/339, RIPEstat routing-status

Announced prefixes (recent window)

IPv4 — 55.83.0.0/16, 55.83.4.0/24, 55.83.50.0/24, 55.83.239.0/24; IPv6 — 2608:12a:4400::/40; ~65,536 IPv4 addresses (more-specific /24s are subsets of the /16) [Confirmed for v4/v6 prefixes; Likely for address estimate] — RIPEstat announced-prefixes

Analyst note

AS rank, customer cone, and a named upstream/peer list are not available from ARIN RDAP or the RIPEstat data fetched (CAIDA not queried) — left Unknown rather than estimated. No dedicated operator website for AS339 specifically; registry domain is mail.mil and the managing agency is DISA (disa.mil).