AS289

AS289 is a legacy autonomous system number registered under ARIN to "Headquarters, USAISC" — the former U.S. Army Information Systems Command — and operated within the U.S. Department of Defense routing fabric. The ARIN RDAP autnum carries a top-level registration date of 1989-06-02, placing it among the early-allocated single-byte ASNs, with a last-changed event of 2011-08-24. The registrant organization (ARIN handle HEADQU-3) is still listed as USAISC even though that command was inactivated in September 1996, redesignated U.S. Army Signal Command and later folded into NETCOM (Army Network Enterprise Technology Command, stood up October 2002); the technical, abuse, and administrative point of contact is DISA-Columbus (disa.columbus.ns.mbx.arin-registrations@mail.mil). Operationally AS289 is a non-transit stub: every routing source consulted (RIPEstat, CAIDA AS Rank) agrees it announces two IPv4 prefixes — 134.194.0.0/16 and 147.241.0.0/19, about 73,728 addresses — plus a single IPv6 prefix 2001:480:36::/48, with one upstream (CAIDA provider degree 1), zero peers, and zero downstream customers. Its CAIDA AS rank is 13,451 and its customer cone is a singleton (itself, 2 prefixes, 73,728 addresses). The block is broadly visible (324/325 v4 and 322/323 v6 RIS peers). RPKI posture could not be assessed because validation was skipped at fetch (no prefix supplied). No notable public abuse signal was found as of 2026-06-25 — AS289 is absent from Spamhaus ASN-DROP, carries a 0% AbuseIPDB confidence on the single in-range IP checked, has no FraudGuard or AlienVault OTX record, and surfaces in no NANOG abuse threads — consistent with a clean, closed government/military network.

Operator

Headquarters, USAISC — U.S. Army Information Systems Command (DoD/U.S. Army; ARIN org handle HEADQU-3) [Confirmed] — ARIN RDAP autnum/289, whois.arin.net/rest/asn/AS289

Country / RIR

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

Allocated

1989-06-02 (ARIN registry date, NOT an IEEE date — IEEE publishes no ASN registration dates); last changed 2011-08-24 [Confirmed] — ARIN RDAP autnum top-level events

Org status

registrant USAISC was established 1984 at Fort Huachuca, AZ and inactivated September 1996 → redesignated U.S. Army Signal Command → folded into NETCOM (est. October 2002). The ARIN record still names "Headquarters, USAISC"; the ASN remains administratively active under DoD [Confirmed for registry naming; Likely for the org-lineage chain via Wikipedia] — ARIN RDAP, en.wikipedia.org/wiki/Army_Network_Enterprise_Technology_Command

Contacts

DISA-Columbus, 300 North James Road, Whitehall, OH 43213; disa.columbus.ns.mbx.arin-registrations@mail.mil; +1-844-347-2457 ext. 2. Registrant location: NETC-ANC CONUS TNOSC, Fort Huachuca, AZ 85613 [Confirmed] — ARIN RDAP autnum/289

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-25 — absent from Spamhaus ASN-DROP (confirmed against asndrop.json), 0% AbuseIPDB confidence on 134.194.21.171, no FraudGuard page (404), no AlienVault OTX data (404), no NANOG abuse threads; a CleanTalk page exists but returned HTTP 403 with no extractable counts

Network & routing

Network type

U.S. federal government / military stub autonomous system under the Department of Defense; non-transit, single upstream; IPinfo categorizes it as Government [Confirmed] — ipinfo.io/AS289, bgp.he.net/AS289

Size

2 IPv4 prefixes (134.194.0.0/16 and 147.241.0.0/19) ≈ 73,728 addresses, plus 1 IPv6 prefix (2001:480:36::/48); customer cone = 1 ASN (itself), 2 prefixes, 73,728 addresses [Confirmed] — RIPEstat announced-prefixes/routing-status, CAIDA AS Rank

Routing/peering

announced and broadly visible — 324/325 v4 and 322/323 v6 RIS peers; CAIDA degree total 1 (upstream 1, peer 0, customer 0); 1 observed neighbour. PeeringDB lists an Open peering policy (no contract/ratio requirement) but no public exchange points or facilities; in practice peers exclusively with AS668 (DoD) [Confirmed for routing counts; Likely for the AS668-only upstream identity — CAIDA gives provider count 1 but does not name it] — RIPEstat routing-status, CAIDA AS Rank, peeringdb.com/asn/289, ipinfo.io/AS289

RPKI

Unknown — RPKI validation was skipped at fetch (no prefix supplied), so posture is not assessable from the collected data [Unknown] — no citation (sourced null)

Notable usage

carries U.S. Army IP allocations; the IPv6 /48 is labeled "High Performance Computing." Routing first seen 2014-04-18, last seen 2026-06-25. bgp.he.net notes the AS announces bogon prefixes [Confirmed for prefixes/dates; Likely for the bogon note — single source] — RIPEstat announced-prefixes/routing-status, bgp.he.net/AS289

Related ASNs

AS668 (U.S. Department of Defense Network Information Center) — the sole upstream peer [Likely — identity from ipinfo/bgp.he.net, not named in CAIDA degree data] — ipinfo.io/AS289, bgp.he.net/AS289

Analyst note

Encountered as an early/legacy single-byte ASN registered to a now-inactivated Army command but still actively routing two Army IPv4 prefixes plus an HPC IPv6 /48 inside the DoD fabric. Clean, low-profile government stub.