AS337

AS337 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD) and operated on the DoD's behalf by the Defense Information Systems Agency (DISA) through its DoD Network Information Center (DNIC/NIC) in Columbus, Ohio. It is not a standalone registry record: ARIN aggregates AS337 inside the contiguous DoD block DNIC-ASBLK-00306-00371, which spans AS306 through AS371 (RDAP handle AS306, startAutnum 306, endAutnum 371). The block carries a top-level ARIN registration event of 1989-06-30 — the first-party registry allocation fact for this ASN — and a last-changed event of 2025-09-12. Operationally AS337 is a closed U.S. military network: it peers only with other DoD autonomous systems (AS306 and AS27066), publishes no public peering policy, and has no PeeringDB entry, consistent with the DoDIN/NIPRNet posture. Routing visibility is intermittent. At the RIPEstat query time (2026-06-28T08:00 UTC) the as-overview reported announced: false with zero actively announced space, yet the announced-prefixes history shows roughly 63 IPv4 prefixes (chiefly within 55.188.0.0/16, plus 139.242.14.0/23 labeled "DoD Network Information Center") and one IPv6 prefix (2608:12b:3500::/40) with timelines ending only two days earlier on 2026-06-26 — so the ASN was routing immediately before the snapshot. RPKI posture cannot be assessed at the AS level (validation requires a specific prefix). No notable public abuse signal was found as of 2026-06-28: AS337 is absent from the Spamhaus ASN-DROP list and the ipapi.is top-1000 abusive-ASN list, the SANS ISC threat level is Green with zero tracked malicious IPs, and no NANOG threads or named advisories reference it. A 2019 DoD-related BGP hijack surfaced in search snippets but could not be confirmed as involving AS337 specifically.

Operator

United States Department of Defense (DoD), operated by DISA through the DoD Network Information Center (DNIC), Columbus, OH; org handle USDDD [Confirmed] — ARIN RDAP autnum/337, ipinfo.io/AS337, bgp.he.net/AS337

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/337, ipinfo.io/AS337

Allocated

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

Org status

active — U.S. federal government combat support agency (DISA), NIC function at 3990 E. Broad Street, Columbus, OH 43218; admin/tech contacts disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil and disa.columbus.ns.mbx.arin-registrations@mail.mil [Confirmed] — ARIN RDAP autnum/337, ipinfo.io/AS337

Contacts

abuse / NOC disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (handle MIL-HSTMST-ARIN), +1-844-347-2457 ext2; DISA-Columbus, 300 North James Road, Whitehall, OH 43213 [Confirmed] — ARIN RDAP autnum/337, 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, not in ipapi.is top-1000 abusive ASNs, SANS ISC threat level Green (zero tracked malicious IPs, last updated 2023-11-28), no NANOG threads; a 2019 DoD-related BGP hijack snippet could not be tied to AS337 specifically [Confirmed for blocklist/ISC nulls; Likely/unverified for the 2019 hijack] — spamhaus.org/drop/asndrop.json, ipapi.is/most-abusive-asn.html, isc.sans.edu/asreport.html?as=337

Network & routing

Network type

U.S. federal government / military network; part of the DoDIN/NIPRNet infrastructure; classified by ipinfo.io as Government [Confirmed] — ipinfo.io/AS337, bgp.tools/as/337

Size

~63 IPv4 prefixes historically (~85,760 addresses across all prefixes, primarily 55.188.0.0/16 subnets and 139.242.14.0/23) and 1 IPv6 prefix (2608:12b:3500::/40); 0 actively announced at the 2026-06-28T08:00 snapshot [Confirmed] — RIPEstat announced-prefixes / as-overview (2026-06)

Routing/peering

closed DoD-internal routing — peers only with AS306 and AS27066; 3 BGP neighbours observed by RIPEstat RIS; no public peering policy and no PeeringDB entry; currently_announced = false at 2026-06-28T08:00 with last BGP activity 2026-06-26

[Confirmed] — bgp.tools/as/337, bgp.he.net/AS337, RIPEstat as-overview/routing-status

RPKI

not assessable at the AS level — RPKI validation requires a specific prefix; bgp.he.net notes RPKI not configured for this ASN [Unknown for AS-level posture / Likely not configured] — bgp.he.net/AS337

Notable usage

one of ~66 ASNs in the DoD DNIC block managed by DISA's NIC in Columbus, OH; prefixes include 55.188.0.0/16 USAISC subnets and 139.242.14.0/23 labeled "DoD Network Information Center"; bgp.he.net flags some bogon prefix announcements [Confirmed] — bgp.he.net/AS337, bgp.tools/as/337

Related ASNs

AS306, AS27066 (observed DoD peers); part of the AS306–371 DNIC block [Confirmed] — bgp.tools/as/337, ARIN RDAP autnum/337

ARIN handle / block

DNIC-ASBLK-00306-00371 (block handle AS306; covers AS 306–371; org handle USDDD) [Confirmed] — ARIN RDAP autnum/337

Analyst note

AS337 is a DoD ASN aggregated under the DNIC block record (AS306–371); there is no separate per-ASN RDAP autnum for AS337, so registry facts (allocated 1989-06-30, last changed 2025-09-12) apply to the whole block. Routing is intermittent/closed-network — announced shortly before the snapshot but reported not-announced at query time.