AS154

AS154 is an early U.S. Department of Defense Autonomous System Number registered with ARIN to "Headquarters, USAISC" — the United States Army Information Systems Command, with the registrant address at Fort Huachuca, AZ and technical/abuse/administrative contact run by DISA Columbus (Whitehall, OH). The DNIC-AS-00154 name follows the DoD Network Information Center convention used for the block of legacy military ASNs assigned through DISA, and AS154 is one of roughly 290 such ASNs held by the same USAISC registrant entity. The ARIN record carries a registration date of 1988-01-08 and was last changed 2011-08-24; the registrant name predates the organization's history, since USAISC was inactivated in 1996 and its engineering successor became USAISEC under CECOM — the ARIN registrant string has simply not been refreshed since 2011, so the org name is historical heritage rather than a current-operator fact. Operationally the ASN is dark: RIPEstat and CAIDA both show zero IPv4 and zero IPv6 prefixes announced, zero observed BGP neighbours, and an empty customer cone (1 ASN, self only). The only prefix ever recorded in RIPEstat history is 155.85.46.0/24, visible from 2012-06-13 through 2021-05-07. CAIDA ranks it AS-rank 79459 (seen=false), consistent with no current presence in the global table. No notable public abuse signal was found as of 2026-06-15, though absence of public signal is not a security clearance — DoD internal incidents would not surface in open feeds.

Operator

Headquarters, USAISC (U.S. Army Information Systems Command); ARIN OrgId/handle HEADQU-3, Fort Huachuca, AZ 85613, US [Confirmed] — ARIN RDAP

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP

Allocated

ARIN ASN registration 1988-01-08; ASN last changed 2011-08-24 (registry dates; IEEE publishes none and is not the source) [Confirmed]

Org status

ARIN status "active" (the ASN object). Registrant entity "Headquarters, USAISC" was inactivated in 1996; engineering successor USAISEC operates under CECOM at Fort Huachuca; ARIN registrant string unchanged since 2011 [Confirmed] — cecom.army.mil / ARIN RDAP

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal, blocklist listing, or NANOG complaint found as of 2026-06-15

Network & routing

Network type

U.S. DoD / Army government network (DNIC legacy block assigned via DISA); operationally dark — no current originations [Confirmed] — ARIN RDAP / RIPEstat

Size

0 routed IPv4 addresses, 0 IPv6 — RIPEstat 0/327 v4 peers, 0/319 v6 peers see it; CAIDA cone 0 prefixes / 0 addresses (2026-06) — stat.ripe.net / api.caida.org

Routing/peering

not visible in the global routing table; 0 observed neighbours, 0 CAIDA provider/peer/customer relationships [Confirmed]. Peering policy Unknown — no PeeringDB entry (HTTP 404) [Unknown]

Historical routing

sole ever-announced prefix 155.85.46.0/24, first seen 2012-06-13, last seen 2021-05-07 (RIPEstat routing-status) [Confirmed]

RPKI

Unknown — no current announcements to validate; RIPEstat rpki-validation skipped (no prefix) [Unknown]

AS rank

CAIDA AS-rank 79459; seen=false; cliqueMember=false [Confirmed] — api.caida.org

Notable usage

one of ~290 DoD/Army ASNs under the USAISC registrant; the ASN itself announces no active prefixes [Confirmed for zero-announcement; ~290 count Likely] — bgp.tools / networksdb.io

Administrative/abuse contact

DISA-Columbus Registration (REGIS10-ARIN), 300 North James Road, Whitehall, OH 43213; disa.columbus.ns.mbx.arin-registrations@mail.mil; +1-844-347-2457 ext.2 [Confirmed] — ARIN RDAP

Source-conflict note

bgp.he.net reported "last visible 2026-04-23," an IPv6 prefix 2402:5260::/32 (CYBERJET PTE LTD), and a peer AS216211 — all conflict with canonical RIPEstat/CAIDA (which show zero announcements and last activity 2021-05-07) and are treated as bogon/stale-cache artifacts, NOT AS154 activity [conflicting sources — canonical kept]

Analyst note

Encountered as a legacy DoD/Army ASN; WHOIS resolves to USAISC (heritage name), abuse handled by DISA Columbus. Operationally dark, clean public record.