AS153

AS153 is a small, legacy U.S. military Autonomous System registered under ARIN to "Headquarters, USAISC" — the U.S. Army Information Systems Command. The ARIN allocation dates to 1988-01-05, making it one of the lower-numbered, early ASNs, and the registrant name has not been refreshed to track the Army's later reorganizations: USAISC was inactivated in 1996, its functions moving to U.S. Army Signal Command and ultimately to NETCOM (U.S. Army Network Enterprise Technology Command) in 2002. Operationally the ASN is a stub: it originates a single IPv4 prefix, 207.133.194.0/24 (256 addresses), announces no IPv6, and reaches the global table through one upstream, AS367 (DoD Network Information Center), with no downstream customers and no IXP presence. RIPE RIS sees the v4 prefix on 326 of 327 peers, so it is well propagated despite its tiny footprint. CAIDA places it at AS Rank ~67,700 with a customer cone of just itself. The /24 carries no RPKI ROA (neither valid nor invalid — effectively unsigned/not-found). Administrative and abuse contact is DISA-Columbus (Defense Information Systems Agency, Whitehall, OH), reflecting DoD/DISA stewardship of the registration. No public abuse signal was found as of 2026-06-15; absence of signal is the expected outcome for a closed government stub network, not an anomaly. RDAP timed out during canonical collection, so registry-level confirmations here rest on RIPEstat, CAIDA, and corroborating BGP trackers.

Operator

Headquarters, USAISC (U.S. Army Information Systems Command; ARIN OrgId HEADQU-3). USAISC was inactivated in 1996; lineage runs to U.S. Army Signal Command then NETCOM (2002), but the ARIN registrant name is unchanged [Confirmed] — RIPEstat as-overview holder, whois.arin.net/rest/asn/AS153, en.wikipedia.org/wiki/Army_Network_Enterprise_Technology_Command

Country / RIR

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

Allocated

ARIN ASN RegDate 1988-01-05; ARIN record last modified 2012-11-06 (RDAP timed out at collection; date from A2 ARIN RDAP read) [Confirmed for the shown date] — rdap.arin.net/registry/autnum/153

Org status

ARIN registration active; registrant org (USAISC) inactivated as a command in 1996, succeeded by Signal Command then NETCOM (2002); administrative/abuse contact DISA-Columbus (DISA, Whitehall, OH) [Confirmed] — peeringdb.com/asn/153, en.wikipedia.org/wiki/Army_Network_Enterprise_Technology_Command

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-15 across Spamhaus DROP/ASN-DROP, AbuseIPDB, NANOG archives, FraudGuard/IPQS/CriminalIP; blocklist status not confirmed via live API

Network & routing

Network type

U.S. federal government / military; stub AS (single-homed, provides no transit) [Confirmed] — bgp.tools/as/153, ipinfo.io/AS153

Size

1 IPv4 prefix — 207.133.194.0/24 (256 addresses); 0 IPv6 prefixes [Confirmed] — RIPEstat announced-prefixes / routing-status, bgp.he.net/AS153 (one security tracker reported "5 IPv4 prefixes," but canonical RIPEstat data and two BGP angles agree on exactly 1)

Routing/peering

sole upstream AS367 (DoD Network Information Center); 1 observed peer (AS367), 0 customers, 0 providers per CAIDA asnDegree; no public peering policy, no IXP membership [Confirmed] — CAIDA ASRank, bgp.he.net/AS153, bgp.tools/as/153, peeringdb.com/asn/153

RPKI

prefix 207.133.194.0/24 has no ROA — neither valid nor invalid origination recorded (effectively NOT-FOUND/unsigned); RIPEstat rpki-validation was skipped (no --prefix supplied) [Likely] — bgp.he.net/AS153

Routing history

first seen 2005-04-12 (prefix 207.133.208.0/24, origin AS153); last seen 2026-06-15 (prefix 207.133.194.0/24) [Confirmed] — RIPEstat routing-status

Notable usage

early/low-number ASN (1988) for a historical U.S. Army network; today a minimal DoD stub originating a single /24 under AS367 [Confirmed] — RIPEstat as-overview, ipinfo.io/AS153

Related ASNs

AS367 (DoD Network Information Center) — sole upstream/transit [Confirmed] — bgp.he.net/AS153, bgp.tools/as/153

Visibility

IPv4 326/327 RIS peers (~99.7%); IPv6 0/319 RIS peers (none announced) [Confirmed] — RIPEstat routing-status

HQ location

ARIN org record lists Fort Huachuca, AZ 85613; admin contact at DISA-Columbus, 300 North James Road, Whitehall, OH 43213. CAIDA lat/lon (39.97, -83.01) maps to central Ohio (the DISA contact), so the exact physical facility is ambiguous [Likely] — rdap.arin.net/registry/autnum/153, CAIDA ASRank

Analyst note

closed DoD/military stub; ARIN registrant name predates the Army's reorganizations. No public-facing website for the ASN (successor command NETCOM at netcom.army.mil). RDAP timed out at canonical collection; registry facts corroborated via RIPEstat/CAIDA. A5 community angle returned an ARIN "no results found" and otherwise abstained — treated as a tooling/abstention miss, not refutation.