AS534

AS534 is a legacy autonomous system registered under ARIN in the DoD Network Information Center (DNIC) numbering block, held by "Headquarters, USAISC" — the U.S. Army Information Systems Command. USAISC itself was disestablished in the mid-1990s, with its command-and-control network mission later folded into what became U.S. Army Network Enterprise Technology Command (NETCOM), but the ARIN registration record was never renamed to reflect that reorganization, so the ASN still carries the original registrant name decades later. The registry's top-level autnum record shows a registration event dated 1989-09-29, corroborated independently by bgp.tools, and a last-changed event of 2011-08-24. Technical, abuse, and administrative contact routes through DISA (Defense Information Systems Agency), Columbus, OH, consistent with DoD-managed ASN space. Operationally the ASN is dormant: every routing source consulted (RIPEstat, CAIDA AS Rank, bgp.he.net, bgp.tools) agrees it announces zero IPv4 and zero IPv6 prefixes, has zero visible BGP peers or upstreams, and sits in a singleton customer cone. No PeeringDB record exists for AS534. RPKI posture cannot be assessed since there are no announcements to validate. No notable public abuse signal was found, though DoD/military ASN blocks generally have low visibility in commercial threat feeds, so that absence carries less evidentiary weight than for a commercial ISP.

Operator

Headquarters, USAISC (U.S. Army Information Systems Command) — ARIN org handle HEADQU-3; registration entry name DNIC-AS-00534 [Confirmed] — https://rdap.arin.net/registry/autnum/534

Country / RIR

US, ARIN [Confirmed] — https://stat.ripe.net/data/abuse-contact-finder/data.json?resource=534

Allocated

1989-09-29 (ARIN RDAP autnum TOP-LEVEL events[], eventAction="registration"); last changed 2011-08-24 [Confirmed, corroborated by bgp.tools] — https://rdap.arin.net/registry/autnum/534, https://bgp.tools/as/534

Org status

active in ARIN's registry (status: active), but the named registrant org (Headquarters, USAISC) is a legacy U.S. Army command disestablished in the 1990s; the record was not renamed to a successor command [Confirmed] — https://rdap.arin.net/registry/autnum/534

Contacts

disa.columbus.ns.mbx.arin-registrations@mail.mil; +1-844-347-2457 ext2; registrant address NETC-ANC CONUS TNOSC, Fort Huachuca, AZ 85613; technical/admin contact address 300 North James Road, Whitehall, OH 43213 [Confirmed] — https://rdap.arin.net/registry/autnum/534

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-10 across Spamhaus, abuse.ch, and NANOG archives; bgp.he.net shows 0 originated prefixes, consistent with a dormant, non-routing legacy DoD block rather than a confirmed-clean actively-announced network

Network & routing

Network type

U.S. Department of Defense / U.S. Army internal network registration (DNIC block); not a commercial ISP or content network [Likely] — https://rdap.arin.net/registry/autnum/534

Size

dormant — 0 IPv4 prefixes / 0 IPv6 prefixes; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — https://api.asrank.caida.org/v2/restful/asns/534, https://stat.ripe.net/data/routing-status/data.json?resource=534

Routing/peering

NOT announced — 0 of 325 RIS IPv4 peers see it, 0 of 322 IPv6 peers, 0 observed neighbours; CAIDA degree total 0 (customer 0, peer 0, provider 0); no PeeringDB record (peeringdb.com/asn/534 = 404)

[Confirmed] — https://stat.ripe.net/data/routing-status/data.json?resource=534, https://www.peeringdb.com/asn/534

RPKI

not assessable — AS534 announces no prefixes so there are no ROAs to validate; RIPEstat rpki-validation was structurally skipped (requires a prefix parameter) [Confirmed] — https://stat.ripe.net/data/rpki-validation/data.json?resource=534

Notable usage

Unknown — no public traffic/usage description found; abuse/registration contact is routed through DISA (disa.columbus.ns.mbx.arin-registrations@mail.mil), consistent with DoD-managed ASN space [Unknown] — https://rdap.arin.net/registry/autnum/534

Related ASNs

none identified in this pass [Unknown]

Analyst note

bgp.he.net displays a conflicting/stale AS name ("RR-RC-VOYSS Solutions-Greensboro") that does not match the authoritative ARIN RDAP registrant; treated as a cached RADB artifact, not evidence of reassignment. RDAP (DNIC-AS-00534 / Headquarters, USAISC) is authoritative.