AS347

AS347 is a legacy autonomous system number held by the United States Department of Defense (DoD) and administered through the Defense Information Systems Agency (DISA) and its DoD Network Information Center (DNIC) in Columbus, Ohio. It does not have its own standalone ARIN record: ARIN RDAP returns the block handle AS306 (DNIC-ASBLK-00306-00371), a contiguous allocation spanning AS306 through AS371 that the DoD manages administratively to segment its address space. The registrant org is the ARIN handle USDDD, and the top-level autnum registration event is dated 1989-06-30, a confirmed first-party RIR fact. AS347 behaves as a single-homed government stub: it provides no transit and, when announcing, peers with only one neighbour (AS306, also a DoD/DNIC ASN). Routing data shows it recently originated eight prefixes inside the 55.64.0.0/16 block (seven IPv4 routes plus one IPv6 route, 2608:18a:1900::/40) active from 2026-06-14 through 2026-06-26, but as of the 2026-06-28 query it is not announcing any space — consistent with an intermittently-routed military allocation. No notable public abuse signal was found: no Spamhaus ASN-DROP listing, no AbuseIPDB or GreyNoise hits, and no NANOG security threads, with only a single historical 2016 BGP update-rate digest mention that was not characterized as an incident. The operator's primary public-facing site is disa.mil; abuse and hostmaster contact runs through the DISA-Columbus NIC.

Operator

United States Department of Defense (DoD), administered by DISA / DoD Network Information Center (ARIN org handle USDDD, DISA-Columbus, OH) [Confirmed] — ARIN RDAP autnum/347, ipinfo.io/AS347

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/347

Allocated

1989-06-30 (ARIN autnum top-level registration event, NOT an IEEE date — IEEE publishes no ASN dates); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum top-level events

Block context

AS347 falls within the DoD NIC block DNIC-ASBLK-00306-00371 (AS306–AS371); ARIN returns the block handle AS306 (startAutnum 306, endAutnum 371), not a per-ASN record [Confirmed] — ARIN RDAP autnum/347

Org status

active U.S. federal agency; DISA is a Combat Support Agency under the DoD; NIC operates from DISA-Columbus, 300 North James Road, Whitehall, OH 43213 (also 3990 E. Broad Street, Columbus, OH 43218) [Confirmed] — ARIN RDAP autnum/347

Contacts

disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (NOC/abuse); ARIN/NIC phone +1-844-347-2457 [Confirmed] — ARIN RDAP autnum/347, RIPEstat abuse-contact-finder (resource=347)

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-28 — not in Spamhaus ASN-DROP, AbuseIPDB, GreyNoise, or NANOG archives; one 2016 BGP update-rate digest mention, not an incident. Confidence Likely (search-based, not live-tool-queried)

Network & routing

Network type

government stub autonomous system; single-homed, provides no transit; sole peer/upstream is AS306 (also DoD/DNIC) [Confirmed] — ipinfo.io/AS347, whoisfreaks.com/tools/asn-whois/lookup/AS347

Size / routing

8 prefixes when announcing (7 IPv4 + 1 IPv6) within 55.64.0.0/16, ~65,536 IPv4 addresses; the /22 and five /24s are more-specifics of the /16. As of 2026-06-28 announces 0 prefixes (withdrawn); 1 observed neighbour confirms single-homed stub

[Confirmed] — RIPEstat announced-prefixes / routing-status (resource=347)

Peering policy

Unknown for AS347 specifically — no published policy; DoD networks interconnect via internal DISN infrastructure rather than public IXPs [Likely] — ipinfo.io/AS347, peeringdb.com/asn/749

RPKI

Unknown — RPKI validation was not run (no prefix supplied to the canonical fetch); no ROA status available [Unknown]

AS rank / customer cone

Unknown — not returned by RIPEstat; CAIDA data not fetched. Single observed neighbour suggests no downstream customers [Unknown]

Notable usage

DoD NIC allocates and registers DoD IP address space and manages .mil infrastructure; AS347 is one of dozens of DNIC stub ASNs (AS306–AS371) segmenting DoD space. 55.x address space is U.S. DoD allocation [Confirmed] — ipinfo.io/AS347, icannwiki.org/Defense_Information_Systems_Agency

Related ASNs

AS306 (block handle / sole peer, also DoD/DNIC); broader DNIC block AS306–AS371 is DoD-managed [Confirmed] — ARIN RDAP autnum/347

Analyst note

Legacy DoD military stub ASN within a block allocation. ARIN returns the block handle AS306, which is expected for DNIC ASNs. Currently withdrawn from the global routing table but recently active in 55.64.0.0/16. Clean, low-profile government infrastructure.