AS536

AS536 is a legacy autonomous system number registered under ARIN to "Headquarters, USAISC" — the U.S. Army Information Systems Command — carrying the RDAP/AS-name handle DNIC-AS-00536, reflecting its origin in the DoD Network Information Center's historic block of ARIN-managed Autonomous System Numbers. The registrant address is listed as NETC-ANC CONUS TNOSC, Fort Huachuca, AZ, with the technical/abuse/administrative point of contact routed to a DISA-Columbus registration mailbox in Whitehall, OH. RDAP status is "active," meaning ARIN considers the allocation administratively current, but the ASN carries no live routing footprint: RIPEstat's as-overview marks it unannounced, its announced-prefixes query (spanning 2000-08-01 through 2026-07-11) returns zero prefixes, and its routing-status shows 0 of 325 RIS peers seeing it in IPv4 and 0 of 322 in IPv6, with zero observed BGP neighbours. CAIDA AS Rank corroborates this: AS536 ranks 79,459th globally, is not seen in BGP (seen=false), is not a clique member, and its customer cone is a singleton consisting only of itself — 0 prefixes, 0 addresses, and all-zero AS-degree (0 upstreams, 0 peers, 0 customers). No PeeringDB record exists for this ASN, and no dedicated public operator website was found; the modern successor command, NETCOM (netcom.army.mil), does not surface a page tying it specifically to AS536. No notable public abuse signal was found, consistent with an ASN that has no currently announced prefixes for abuse/threat feeds to observe. This is a dormant, allocated-but-unrouted U.S. Army/DoD administrative ASN.

Operator

Headquarters, USAISC (U.S. Army Information Systems Command); RDAP AS-name/handle DNIC-AS-00536 [Confirmed] — https://rdap.arin.net/registry/autnum/536

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/536 (authoritative_rir=arin per RIPEstat abuse-contact-finder)

Allocated

1989-09-29 (ARIN RDAP autnum TOP-LEVEL registration event); last changed 2011-08-02 [Confirmed] — https://rdap.arin.net/registry/autnum/536 (top-level events[], not the entity-level REGIS10-ARIN/HEADQU-3 dates, which were correctly excluded as POC/org-record dates)

Org status

active per ARIN RDAP administrative record; no evidence of current public routing activity [Confirmed] — https://rdap.arin.net/registry/autnum/536

Contacts

Registration (REGIS10-ARIN); disa.columbus.ns.mbx.arin-registrations@mail.mil; +1-844-347-2457 ext. 2 [Confirmed] — https://rdap.arin.net/registry/autnum/536

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-11 — general web/threat-intel and NANOG mailing-list searches returned no records implicating AS536 in spam, malware, botnet, or blocklist activity; consistent with an unannounced ASN presenting no live traffic surface

Network & routing

Network type

U.S. Army / DoD internal network administration entity (legacy DNIC allocation); not a commercial ISP [Likely] — https://rdap.arin.net/registry/autnum/536

Size / routing

dormant — 0 IPv4 and 0 IPv6 announced prefixes; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses; 0/325 RIS peers see it in IPv4, 0/322 in IPv6; 0 observed neighbours [Confirmed] — https://stat.ripe.net/AS536, https://asrank.caida.org/asns/536

Peering

no PeeringDB network profile exists for AS536; CAIDA reports all-zero AS-degree (0 upstreams, 0 peers, 0 customers) [Confirmed absence of record] — https://www.peeringdb.com/asn/536, https://asrank.caida.org/asns/536

RPKI

not assessable — RIPEstat's rpki-validation check was skipped (requires a specific prefix) and AS536 announces none, so there are no ROAs to evaluate [Unknown / not applicable] — https://stat.ripe.net/AS536

Notable usage

none observed — dormant since at least the RIPEstat/RouteViews archive window (2000-08-01 onward); no public NANOG, Reddit, or outage-reputation records found [Confirmed absence of record] — https://stat.ripe.net/AS536

Registrant address

NETC-ANC CONUS TNOSC, Fort Huachuca, AZ 85613, US (registrant org HEADQU-3); technical/abuse/admin POC "Registration" group at DISA-Columbus, 300 North James Road, Whitehall, OH 43213 [Confirmed] — https://rdap.arin.net/registry/autnum/536

Official operator website

Unknown — no dedicated public site for AS536 or NETC-ANC CONUS TNOSC found; NETCOM (netcom.army.mil) could not be fetched (HTTP 403) and no page there ties to AS536 specifically [Unknown] — https://www.netcom.army.mil/

Analyst note

Sibling entry to the already-committed AS525 (same DNIC/USAISC family, same dormant pattern) — allocated-but-unrouted DoD administrative ASN with no live BGP footprint and no notable abuse history.