AS142

AS142 is a low-numbered legacy Autonomous System Number registered under ARIN to "Headquarters, USAISC," the United States Army Information Systems Command. It sits inside the DoD Network Information Center (DNIC) block — the ARIN-managed pool of early ASNs assigned to U.S. Department of Defense organizations — and the ARIN AS name DNIC-AS-00142 reflects that heritage. The triage point is that this is a government/military legacy registration, not a commercial ISP, and it is operationally dark: as of June 2026 AS142 announces zero IPv4 and zero IPv6 prefixes, holds no address space, and is seen by none of RIPEstat's ~326 IPv4 / ~319 IPv6 RIS peers; CAIDA likewise marks it not-seen with an AS-rank of 79,459 and zero degree on every axis. bgp.he.net independently confirms 0 prefixes and 0 peers. USAISC itself is a defunct command — established 1984 (redesignated from U.S. Army Communications Command) and inactivated/realigned in 1996, with network functions later passing to the Army Network Enterprise Technology Command (NETCOM, est. 2002) at Fort Huachuca, Arizona. The ARIN record persists as a legacy artifact under the original name. No notable public abuse or threat signal was found as of June 2026 — an expected null for an ASN that routes nothing and therefore presents no observable attack surface. RPKI posture is genuinely unassessable: with no announced prefixes there is nothing for a ROA to cover.

Operator

Headquarters, USAISC — United States Army Information Systems Command (U.S. DoD); ARIN registrant handle HEADQU-3, registration POC DISA-Columbus [Confirmed] — ARIN RDAP (https://rdap.arin.net/registry/autnum/142)

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP; ASN range 1–1876 assigned by ARIN per IANA (https://www.iana.org/assignments/as-numbers/as-numbers.xhtml)

Allocated

ARIN autnum registration 1987-12-15; ASN last changed 2011-08-02 (registrant org HEADQU-3 itself registered 1990-03-26, last changed 2025-03-13) [Confirmed for the shown registry dates] — ARIN RDAP

Org status

defunct / realigned. USAISC established 1984, inactivated 1996; functions passed to successor Army signal/network commands and ultimately NETCOM (est. 2002), HQ Fort Huachuca, AZ. ARIN registration persists under the legacy name

[Confirmed] — globalsecurity.org/military/agency/army/isec.htm, en.wikipedia.org/wiki/Army_Network_Enterprise_Technology_Command

Website

none current — USAISC was inactivated and has no live official site; sibling DoD ASNs list mail.mil contacts [Likely] — peeringdb.com/asn/289

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-13; not in Spamhaus DROP/ASN-DROP, no NANOG-archive mentions, no threat-feed hits — consistent with a zero-prefix dormant ASN

Network & routing

Network type

U.S. Army / DoD government network within the DNIC ASN block; legacy, currently dormant (0 IPv4, 0 IPv6, no announced prefixes) [Confirmed] — RDAP / RIPEstat / bgp.he.net (2026-06-13)

Size

none routed — 0 IPv4 prefixes, 0 IPv6 prefixes, 0 addresses; CAIDA customer cone = 1 ASN (itself) / 0 prefixes / 0 addresses [Confirmed] — RIPEstat routing-status, CAIDA AS-rank (https://api.caida.org/as-rank/v1/asns/142)

Routing/peering

not announcing; 0 observed BGP neighbours, 0 RIS peers seeing it (v4 0/326, v6 0/319); CAIDA degree total/customer/peer/provider all 0; no upstream on record [Confirmed] — RIPEstat routing-status (https://stat.ripe.net/data/routing-status/data.json?resource=142), bgp.he.net/AS142

RPKI

Unknown / not assessable — RIPEstat rpki-validation skipped (no prefix to validate); the AS announces nothing, so no ROA posture exists [Confirmed as unassessable] — RIPEstat rpki-validation

Notable usage

one of ~350+ DNIC-block ASNs tied to Headquarters, USAISC; the command managed Army-wide information systems through the Cold War and Operations Desert Shield/Storm. AS142 itself carries no address space today and is operationally dormant [Likely for the historical role; Confirmed for the dormant state] — networksdb.io, en.wikipedia.org/wiki/Army_Network_Enterprise_Technology_Command

Related ASNs

part of the broader DNIC / DoD ASN family registered to USAISC and successor organizations; no peer/upstream ASNs observed for AS142 specifically [Likely] — RDAP, CAIDA AS-rank

Analyst note

Encountered as a dark legacy DoD registration. WHOIS resolves to Headquarters, USAISC; the AS does not participate in the public BGP table. Null abuse/RPKI findings are expected, not data gaps.