AS307

AS307 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD), held within the DNIC ASN block DNIC-ASBLK-00306-00371 (which spans AS306 through AS371) and administered operationally by the Defense Information Systems Agency (DISA) through the DoD Network Information Center (DNIC) at DISA-Columbus, Ohio. The block-level ARIN autnum registration dates to 1989-06-30, and the record was last changed 2025-09-12. The key triage point for AS307 is that it is effectively dark today: RIPEstat reports announced=false, with zero IPv4 and zero IPv6 prefixes currently originated and 0 of 323 v4 / 0 of 321 v6 RIS peers seeing any announcement as of 2026-06-27. It does carry routing history — the single IPv4 prefix 55.195.0.0/16, historically labeled "Headquarters, USAISC" (U.S. Army Information Systems Command), was visible from 2015-12-11 through 2025-11-24 and is flagged as a bogon by Hurricane Electric's toolkit — but the ASN has not been visible in the global table since roughly mid-December 2025. CAIDA timed out, so AS rank, customer cone, and upstream topology are unavailable from that source and remain Unknown. No notable public abuse signal was found as of June 2026 — not in Spamhaus ASN-DROP, CleanTalk (0.00% spam rate), the ipapi.is most-abusive ranking, or NANOG archives — consistent with a clean, dormant government-held ASN.

Operator

United States Department of Defense (DoD), registrant org handle USDDD; managed by DISA via the DoD Network Information Center (DNIC) [Confirmed] — ARIN RDAP autnum/307, ipinfo.io/AS307

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/307, RIPEstat abuse-contact-finder (authoritative_rir: arin)

Allocated

1989-06-30 (ARIN block-level autnum top-level registration event, NOT an IEEE date — IEEE publishes no ASN registration dates); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum/307 top-level events

Org status

active U.S. federal agency; registrant address 3990 E. Broad Street, Columbus, OH 43218; operationally managed at DISA-Columbus, 300 North James Road, Whitehall, OH 43213 [Confirmed] — ARIN RDAP autnum/307, disa.mil

Contacts

NOC/Technical/Abuse disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (MIL-HSTMST-ARIN); Admin/Technical disa.columbus.ns.mbx.arin-registrations@mail.mil (REGIS10-ARIN); phone +1-844-347-2457 ext 2 [Confirmed] — ARIN RDAP autnum/307

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-28 — not in Spamhaus ASN-DROP, CleanTalk (0.00% spam rate), ipapi.is most-abusive list, or NANOG archives

Network & routing

Network type

U.S. federal government / military; AS307 is legacy and currently inactive in global routing [Confirmed] — ARIN RDAP autnum/307, bgp.he.net/AS307

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes currently announced [Confirmed] — RIPEstat routing-status (resource=307, 2026-06-27)

Routing/peering

NOT announced — announced=false; 0/323 v4 and 0/321 v6 RIS peers seeing it; 0 observed neighbours [Confirmed]. No PeeringDB entry for AS307; no published peering policy [Confirmed] — RIPEstat as-overview / routing-status, peeringdb.com

Routing history

prefix 55.195.0.0/16 first seen 2015-12-11, last seen 2025-11-24; dark since ~2025-12-15. Prefix historically labeled "Headquarters, USAISC" and flagged as a bogon [Confirmed] — RIPEstat routing-status, bgp.he.net/AS307, bgp.tools/as/307

RPKI

not assessable — AS307 announces no prefixes, so there is nothing to validate (RIPEstat rpki-validation skipped, no prefix) [Confirmed] — A1 canonical RIPEstat

AS rank / customer cone / upstreams

Unknown — CAIDA lookup timed out; no upstream or topology data available from any consulted source [Unknown] — (CAIDA aborted on timeout)

Notable usage

sole historical prefix 55.195.0.0/16 associated with Headquarters, U.S. Army Information Systems Command (USAISC, Fort Huachuca, AZ); non-publicly-routed/bogon DoD address space; sole observed historical BGP peer was AS306 (also DoD) [Confirmed/Likely] — bgp.he.net/AS307, ipinfo.io/AS307

Related ASNs

AS306 (sole historical observed peer, also DoD); the broader DNIC block AS306–AS371 is DoD-held [Confirmed] — ARIN RDAP autnum/307, bgp.he.net/AS307

Block/name

DNIC-ASBLK-00306-00371 — the DoD NIC block covering AS306–AS371, handle USDDD [Confirmed] — ARIN RDAP autnum/307, RIPEstat as-overview

Analyst note

Encountered as a dormant legacy government ASN within the DoD DNIC block; WHOIS/RDAP resolve to DoD via DISA. DoD has a documented pattern (e.g. AS8003, Jan 2021) of re-announcing dormant IPv4 space, but no specific re-announcement campaign for AS307 was found.