AS333

AS333 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD). It is not registered as a standalone autnum: ARIN RDAP returns the contiguous block record DNIC-ASBLK-00306-00371 (handle AS306, spanning AS306 through AS371), which is the registration container for this range of DoD ASNs. The block is administered by the Defense Information Systems Agency (DISA) through its DoD Network Information Center (DNIC), operated from DISA-Columbus in Whitehall/Columbus, Ohio. The key triage point for AS333 is that it is dormant today: RIPEstat reports announced: false, zero IPv4 and zero IPv6 prefixes, and 0 of ~326 v4 / 0 of ~324 v6 RIS peers seeing it as of 2026-06-28, with 0 observed neighbours. Historically it was visible in BGP — first seen 2013-10-29 announcing 2001:480:11::/48 and last seen 2020-08-31 announcing 198.253.48.0/20 (community sources put the final withdrawal around 2018). The block's RDAP top-level registration event is 1989-06-30, with the record last changed 2025-09-12; status is active. RPKI posture cannot be assessed because there are no current originations, and CAIDA AS Rank was unavailable (HTTP 502) at query time. No notable public abuse signal was found as of 2026-06-28 — AS333 is absent from Spamhaus ASN-DROP, shows clean CleanTalk metrics, and has no NANOG or threat-intel discussion attributable to it.

Operator

United States Department of Defense (DoD), administered by DISA via the DoD Network Information Center (DNIC); ARIN registrant org handle USDDD [Confirmed] — ARIN RDAP autnum/333 (block AS306), https://rdap.arin.net/registry/autnum/333

Country / RIR

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

Allocated

1989-06-30 (ARIN block registration event for DNIC-ASBLK-00306-00371; RIR first-party date, NOT an IEEE date); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum top-level events

Org status

active U.S. federal government — DISA is a DoD combat support agency; ARIN block record status active, last changed 2025-09-12 [Confirmed] — ARIN RDAP

Contacts

abuse/NOC/tech disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (MIL-HSTMST-ARIN); admin/tech disa.columbus.ns.mbx.arin-registrations@mail.mil (REGIS10-ARIN); phone +1-844-347-2457 ext 2; DISA-Columbus, 300 North James Road, Whitehall, OH 43213; registrant address 3990 E. Broad Street, Columbus, OH 43218

[Confirmed] — ARIN RDAP, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-28 — absent from Spamhaus ASN-DROP, clean CleanTalk metrics, no NANOG threads or BGP-hijack reports attributable to AS333; dormant/zero-prefix DoD ASN

Network & routing

Network type

U.S. federal government / military network; AS333 is legacy and currently inactive (0 prefixes announced) [Confirmed] — ARIN RDAP, RIPEstat as-overview (announced: false)

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes; 0 observed neighbours [Confirmed] — RIPEstat routing-status / announced-prefixes (2026-06-28)

Routing/peering

NOT announced — 0 RIS peers seeing it (0/326 v4, 0/324 v6); first seen in BGP 2013-10-29 (2001:480:11::/48), last seen 2020-08-31 (198.253.48.0/20); community sources note withdrawal from the global table circa 2018-03-21 [Confirmed for RIPEstat figures; Likely for 2018 withdrawal date via bgp.tools/bgp.he.net]

Peering policy

Unknown — no public peering policy documented for AS333 or the DNIC block on PeeringDB or DISA pages; AS333 carries zero prefixes [Unknown] — peeringdb.com/org/17705

RPKI

not assessable — AS333 announces no prefixes, so there are no active routes/ROAs to validate; RIPEstat rpki-validation skipped (no prefix supplied / nothing announced) [Unknown]

AS rank / customer cone

Unknown — CAIDA AS Rank API returned HTTP 502 at query time [Unknown] — api.asrank.caida.org

Notable usage

The DoD Network Information Center (DNIC) is the DoD enterprise authority for IP address management, .mil domain registration, and DNS, including operation of the G DNS root nameserver (g.root-servers.net). AS333 specifically is inactive; DoD operational traffic has historically run under other ASNs [Confirmed for DNIC role; Likely for the broader DoD-ASN context] — disa.mil/G-Root, ARIN RDAP

Block / record

DNIC-ASBLK-00306-00371 (handle AS306; startAutnum 306, endAutnum 371) — AS333 falls inside this DoD ASN block and has no standalone autnum record [Confirmed] — ARIN RDAP autnum/333

Analyst note

AS333 is a dormant legacy DoD ASN with no standalone RDAP autnum record — ARIN returns the parent block DNIC-ASBLK-00306-00371. Clean and inactive; no current attack surface attributable to this ASN.