AS317

AS317 is an ARIN-registered autonomous system number held by the United States Department of Defense (DoD), managed operationally by the DoD Network Information Center (DNIC) — a function of the Defense Information Systems Agency (DISA) at its Columbus, Ohio facility. The number has no individual RDAP record of its own; it falls inside the contiguous block autnum object DNIC-ASBLK-00306-00371 (AS306 through AS371), whose registrant handle is USDDD. That block's ARIN RDAP top-level registration event dates to 1989-06-30, making AS317 one of the early federal allocations. Unlike a dormant legacy ASN, AS317 is operationally active: RIPEstat enumerates nine IPv4 prefixes and one IPv6 prefix, anchored by 55.11.0.0/16 (65,536 addresses) plus several /24 and /21 ranges in 55.11.0.0 and 139.241–139.242 space, and the IPv6 block 2608:14b:1700::/40 — roughly 67,000–70,000 routed IPv4 addresses in total. RIPEstat's as-overview reported announced:false at the 2026-06-28 query instant while the announced-prefixes endpoint showed the same prefixes active through 2026-06-26, consistent with a brief withdrawal or a short propagation/data lag rather than a true silent ASN. BGP topology shows about three upstreams and three peers with no downstream customer cone — a closed government transit posture, not a commercial network. Every public abuse and threat feed examined (Spamhaus ASN-DROP, CleanTalk, NANOG archives, AbuseIPDB) returns a null signal; the 2021 NANOG controversy over anomalous DoD prefix announcements concerned AS8003 (GRS-DoD), not AS317. This is a clean, well-established U.S. federal military infrastructure ASN.

Operator

United States Department of Defense (DoD), managed operationally by the DoD Network Information Center (DNIC), a function of DISA [Confirmed] — ARIN RDAP autnum/306 (registrant USDDD), ipinfo.io/AS317, bgp.tools/as/317

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/317, RIPEstat abuse-contact-finder (authoritative_rir: arin)

Allocated

1989-06-30 (ARIN registry first-registration event on the block autnum DNIC-ASBLK-00306-00371; this is the RIR-authoritative top-level registration date, NOT an entity/org-record event) [Confirmed] — ARIN RDAP autnum/317 top-level events[]

Org status

U.S. federal government agency (Department of Defense); ARIN registrant handle USDDD; registrant address 3990 E. Broad Street, Columbus, OH 43218 [Confirmed] — ARIN RDAP autnum/317

Contacts

disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (NOC/technical/abuse); disa.columbus.ns.mbx.arin-registrations@mail.mil (administrative); +1-844-347-2457 ext 2; DISA-Columbus, 300 North James Road, Whitehall, OH 43213 [Confirmed] — ARIN RDAP autnum/317, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal as of 2026-06-28 — absent from Spamhaus ASN-DROP (2026-05-29 edition), CleanTalk shows 0% spam (1 email, 0 blacklisted), no AS317-specific NANOG threads, AbuseIPDB ASN page 404. The 2021 NANOG DoD-prefix controversy involved AS8003, not AS317

Network & routing

Network type

U.S. federal government military network; upstreams and peers are other DoD/DISA ASNs, no commercial downstream customers [Confirmed] — bgp.tools/as/317, ipinfo.io/AS317

Size

~67,000–70,000 routed IPv4 addresses; anchored by 55.11.0.0/16 (65,536) plus /24 and /21 ranges in 55.11.x and 139.241–242.x; one IPv6 prefix [Likely] — RIPEstat announced-prefixes (resource=AS317)

Routing/prefixes

9 IPv4 prefixes (139.242.53.0/24, 139.241.6.0/24, 55.11.16.0/24, 55.11.0.0/16, 55.11.152.0/21, 55.11.151.0/24, 55.11.8.0/24, 55.11.144.0/23, 55.11.150.0/24) + 1 IPv6 (2608:14b:1700::/40); as-overview announced:false at query time while announced-prefixes active through 2026-06-26 — likely brief withdrawal or data lag

[Likely on announced state] — RIPEstat as-overview / announced-prefixes (resource=AS317)

Peering/topology

~3 upstreams, ~3 peers, 0 downstream customers (no transit provided) [Likely] — bgpview.io/asn/317. No PeeringDB entry for AS317 itself (HTTP 404); related DNIC ASNs list "Open" but that cannot be attributed to AS317 [Unknown for AS317 policy] — peeringdb.com/asn/749

RPKI

not assessable from available data — RIPEstat rpki-validation skipped (requires a prefix argument); no ROA coverage retrieved [Unknown] — RIPEstat rpki-validation (resource=AS317)

AS rank

Unknown — no CAIDA AS-rank data returned for AS317 [Unknown]

Notable usage

part of the DoD DNIC block; the DNIC also operates G.root-servers.net (one of the 13 root name servers) and supports the DISN (Defense Information System Network), including NIPRNet and SIPRNet

[Confirmed for DISN/G-root operator role] — ipinfo.io/AS317, en.wikipedia.org/wiki/Defense_Information_System_Network

Related ASNs

AS306, AS1733, AS27064 (upstream/peer DoD ASNs); other DoD DNIC ASNs include AS138, AS360, AS749 [Likely per third-party DB] — peeringdb.com/org/17705, bgp.tools/as/317

Last changed (RIR)

2025-09-12 [Confirmed] — ARIN RDAP autnum/317 top-level events[]

Block name

DNIC-ASBLK-00306-00371 (covers AS306–AS371; AS317 has no individual RDAP record and inherits this block object) [Confirmed] — ARIN RDAP autnum/317

Analyst note

Active federal military ASN with no individual RDAP record (covered by the DNIC block object). Allocation date 1989-06-30 read from the block autnum's top-level registration event; nested entity events (1993, 2007, 2009) are contact/org-record dates and were ignored. Clean public reputation.