AS147

AS147 is a legacy, very-low-number Autonomous System registered under ARIN to the United States Department of Defense (DoD), administered through the DoD Network Information Center (DNIC) and operated by the Defense Information Systems Agency (DISA) out of Columbus/Whitehall, Ohio. Its ARIN handle is DNIC-AS-00147 and the registrant org is USDDD; the ARIN record carries a registration date of 1987-12-21, placing it among the earliest ASNs issued in the ARPANET/early-Internet era. Operationally the ASN is effectively dormant in the public Internet: as of mid-2026 it announces zero IPv4 and zero IPv6 prefixes, and no RIS route collectors (0 of 326 IPv4 peers, 0 of 320 IPv6 peers) see it. Its single historically originated prefix, 215.1.84.0/24, last appeared in public BGP feeds around 2026-04-02/03 and first appeared in March 2013. CAIDA places it at AS-rank ~79,006 with a customer cone of just itself, one provider relationship and one observed neighbour (AS27066, another DoD AS) — connectivity that most likely runs over the non-public DISN rather than civilian transit. The ARIN record was last updated 2025-09-12. No notable public abuse signal was found as of 2026-06-13: AS147 is absent from Spamhaus DROP/ASN-DROP/SBL/XBL and carries a Scamalytics ISP fraud score of 0/100. The 2021 NANOG controversy over sudden DoD address announcements concerned AS8003, not AS147. No AS147-specific public peering policy exists.

Operator

United States Department of Defense (DoD), via the DoD Network Information Center (DNIC), operated by DISA; ARIN OrgId USDDD [Confirmed] — ARIN RDAP (rdap.arin.net/registry/autnum/147)

AS name / handle

DNIC-AS-00147 (RDAP handle AS147) [Confirmed] — ARIN RDAP; bgp.he.net/AS147

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP

Org status

active ARIN allocation (status "active"); registered and maintained but originating 0 prefixes [Confirmed] — ARIN RDAP, bgp.tools/as/147

Website

no dedicated public site for AS147; DoD top-level defense.gov, DISA at disa.mil [Likely] — defense.gov, disa.mil

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-13; absent from Spamhaus DROP/ASN-DROP/SBL/XBL and Shadowserver feeds; Scamalytics ISP fraud score 0/100

Network & routing

Network type

U.S. federal government / military network; legacy government stub AS, currently dormant in the public routing table [Confirmed] — bgp.tools/as/147, ipinfo.io/AS147

Routing

0 IPv4 and 0 IPv6 prefixes announced as of 2026-06; sole historically originated prefix 215.1.84.0/24 (256 addresses), first seen 2013-03-06, last seen ~2026-04-02/03 [Confirmed] — bgp.he.net/AS147, RIPEstat routing-status

Upstreams / peering

no upstream named in public BGP data; likely routed over the non-public DISN (Defense Information Systems Network), invisible to civilian collectors [Likely] — bgp.he.net/AS147; no AS147-specific public peering policy found [Unknown] — peeringdb.com/org/17705

RPKI

not assessed (RIPEstat rpki-validation skipped — no prefix supplied); no publicly visible ROA coverage for 215.1.84.0/24 [Likely] — bgp.he.net/AS147

Notable usage

one of the earliest-registered ASNs (Dec 1987). The 2021 NANOG controversy over sudden DoD address announcements involved AS8003 (GRSCORP), NOT AS147 [Confirmed] — seclists.org/nanog/2021, kentik.com/blog/the-mystery-of-as8003

Registered

ARIN ASN RegDate 1987-12-21 (this is the ARIN database registration date, NOT an IEEE or IANA date) [Confirmed] — ARIN RDAP

Last updated (ARIN)

2025-09-12 (one third-party tracker shows an older 2012-07-26 cached value; ARIN RDAP is authoritative) [Confirmed for RDAP value] — ARIN RDAP; bgp.tools/as/147

Visibility

0 of 326 IPv4 RIS peers, 0 of 320 IPv6 RIS peers see it (query 2026-06-14) [Confirmed] — RIPEstat routing-status

Connectivity (CAIDA)

AS-rank ~79,006; total degree 1 (provider 1, peer 0, customer 0); customer cone = 1 ASN (itself), 0 prefixes, 0 addresses; one observed neighbour AS27066 (another DoD AS) [Confirmed] — CAIDA AS-rank; bgp.he.net/AS147

Technical / abuse contact

Network DoD, handle MIL-HSTMST-ARIN (NOC/Technical/Abuse), disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil, +1-844-347-2457 ext.2; registration contact REGIS10-ARIN, disa.columbus.ns.mbx.arin-registrations@mail.mil [Confirmed] — ARIN RDAP

Registrant address

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

Analyst note

a clean, dormant legacy government ASN. WHOIS resolves to DoD/DISA via ARIN; near-zero public footprint. The 215.1.84.0/24 (DoD 215.x legacy space) behaviour is consistent with internal DoD routing practice.