AS341

AS341 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) out of Columbus, Ohio. It is not a standalone registry object: ARIN maintains a single block record, DNIC-ASBLK-00306-00371, that covers the contiguous range AS306–AS371, with the authoritative autnum carrying the handle AS306 and a top-level registration event of 1989-06-30. AS341 inherits its allocation facts from that block. The ASN is a closed government stub — single-homed, providing no transit — and bgp.tools tags it "Government." Both its sole peer and sole upstream are AS306, another DoD/DNIC ASN, so all traffic flows inside the DoD numbering space. As of 2026-06-28 RIPEstat reports AS341 is not currently announcing any prefixes (announced: false, 0 v4 and 0 v6), though a two-week historical lookback (June 14–26 2026) shows six IPv4 prefixes — 55.47.0.0/16, 55.88.0.0/16, and four /24s under 55.88.x — plus one IPv6 prefix, 2608:12b:5300::/40. These are legitimate DoD allocations, not bogon space. RPKI posture is NotFound (no ROAs published), a common pattern for legacy DoD ASNs. No notable public abuse signal was found as of 2026-06-28 — AS341 is absent from Spamhaus ASN-DROP, CleanTalk reports a 0.00% spam rate, and no NANOG, AbuseIPDB, or BGP-incident reports attribute activity to it — consistent with a clean, low-footprint government stub.

Operator

United States Department of Defense (DoD); administered by DISA, Columbus, OH (ARIN OrgID USDDD) [Confirmed] — ARIN RDAP autnum/341, ipinfo.io/AS341, bgp.tools/as/341

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/341; RIPEstat abuse-contact-finder (authoritative_rir: arin)

Allocated

1989-06-30 (ARIN block registration date — first-party RIR fact, NOT an IEEE date); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum top-level events (block handle AS306)

Org status

active U.S. federal agency (Department of Defense); ASN block registered 1989-06-30, last updated 2025-09-12 [Confirmed] — ARIN RDAP autnum/341, bgp.tools/as/341

Contacts

hostmaster — disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (MIL-HSTMST-ARIN, Network DoD), +1-844-347-2457 ext. 2; registrations — disa.columbus.ns.mbx.arin-registrations@mail.mil (REGIS10-ARIN); abuse — disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil

[Confirmed] — ARIN RDAP autnum/341, 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, CleanTalk reports 0.00% spam / 0 abusive IPs, no NANOG/AbuseIPDB/DShield reports, no BGP hijack or route-leak attributed to AS341

Network & routing

Network type

government stub AS — single-homed, no transit; tagged "Government" by bgp.tools; closed DoD infrastructure [Confirmed] — bgp.tools/as/341, ipinfo.io/AS341, ARIN RDAP

Routing/peering

single upstream and single peer, both AS306 (DoD/DNIC); 1 observed neighbour; no PeeringDB record (404); no public peering policy — DoD networks are closed-loop [Confirmed] — bgp.tools/as/341, ipinfo.io/AS341, RIPEstat routing-status

RPKI

NotFound — no ROAs published; bgp.he.net shows 0 RPKI-valid and 0 RPKI-invalid origins; not a current abuse signal [Likely] — bgp.he.net/AS341

AS rank / customer cone

Unknown — not retrieved in the canonical fetch [Unknown]

Related ASNs

AS306 (DoD/DNIC; sole peer and upstream, holds the block autnum); broader block AS306–AS371 [Confirmed] — ARIN RDAP autnum/341, bgp.tools/as/341

ARIN handle / block

DNIC-ASBLK-00306-00371; block covers AS306–AS371, top-level autnum handle AS306; AS341 falls within the block [Confirmed] — ARIN RDAP autnum/341

Currently announced

false — 0 IPv4 and 0 IPv6 prefixes routed as of 2026-06-28 [Confirmed] — RIPEstat as-overview / routing-status (resource=341)

Historical prefixes (2-week window, Jun 14–26 2026)

IPv4 — 55.47.0.0/16, 55.88.0.0/16, 55.88.2.0/24, 55.88.136.0/24, 55.88.137.0/24, 55.88.138.0/24; IPv6 — 2608:12b:5300::/40 [Confirmed] — RIPEstat announced-prefixes (resource=341)

First/last seen routing

first seen 2009-05-07 (55.88.0.0/16); last seen 2026-06-26 (55.88.2.0/24) [Confirmed] — RIPEstat routing-status (resource=341)

IRR record

Unknown — no per-AS IRR/RADB aut-num object publicly retrieved for AS341 within the block [Unknown]

Org address

3990 E. Broad Street, Columbus, OH 43218 (registrant); DISA-Columbus, 300 North James Road, Whitehall, OH 43213 (NOC/technical) [Confirmed] — ARIN RDAP autnum/341

Analyst note

encountered as a closed DoD government stub ASN whose registry facts derive from the shared block DNIC-ASBLK-00306-00371. Currently not announcing; historical prefixes are legitimate DoD space; clean abuse posture.