AS615

AS615 is an early, government-allocated Autonomous System Number registered under ARIN as "DNIC-AS-00615," held by the registrant handle "Headquarters, USAISC." Unlike most of the low-numbered legacy Department of Defense ASNs that have sat completely dark for decades, AS615 was actively announced in the global routing table for over a decade: RIPEstat's routing-status history shows it originating a single IPv4 block, 155.85.163.0/24, continuously from June 2014 through March 2026, before dropping off the table entirely by the time of this research pass in July 2026. Today it shows zero announced IPv4 and IPv6 prefixes, zero visible BGP peers or upstreams in CAIDA's or RIPE RIS's current topology, and a singleton customer cone (itself, 0 prefixes, 0 addresses) — consistent with a recently withdrawn, rather than never-used, government network. Administrative and abuse contact routes to DISA-Columbus, the Defense Information Systems Agency's registration desk in Whitehall, Ohio, while the underlying registrant address traces to Fort Huachuca, Arizona. One research pass surfaced a plausible-looking operator domain (usainscom.army.mil, belonging to U.S. Army INSCOM — Intelligence and Security Command) that does not match the ARIN record's "USAISC" abbreviation (commonly expanded as Army Information Systems Command); that identification is flagged as unconfirmed rather than adopted. No public abuse signal was found against AS615 in the sources checked.

Operator / registrant

DNIC-AS-00615 - Headquarters, USAISC (ARIN handle HEADQU-3; registrant address Fort Huachuca, AZ 85613) [Confirmed] — https://rdap.arin.net/registry/autnum/615

Country / RIR

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

Allocated

1990-04-05 (ARIN autnum TOP-LEVEL registration event; NOT an IEEE/OUI-style date); top-level last-changed 2011-08-02 [Confirmed, agreed independently by two research angles] — https://rdap.arin.net/registry/autnum/615

Org status

ARIN registration status Active [Confirmed]. Third-party aggregator ipinfo.io separately labels it network-type "inactive" as of its own last-updated snapshot (2011-08-02) — a routing-visibility label, not an ARIN registration fact, and now superseded by the 2014-2026 announcement history above

[Likely] — https://rdap.arin.net/registry/autnum/615, https://ipinfo.io/AS615

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-17 in Spamhaus's ASN-DROP/DROP resource pages, NANOG mailing-list archive search, or the community ASN blocklist repos checked (bad-asn-list variants, firehol blocklist-ipsets); this is a bounded, non-authenticated search, not an exhaustive query against those services' own lookup tools

Network & routing

Network type / operator identity

U.S. federal government / Dept. of the Army network (non-commercial). "USAISC" is commonly expanded in public histories as U.S. Army Information Systems Command, later folded into Army Signal Command/NETCOM structures. A separate research angle instead cited usainscom.army.mil (U.S. Army INSCOM — Intelligence and Security Command, a different organization with a similarly-spelled domain); that identification conflicts with the RIR's "USAISC" abbreviation and is NOT adopted here [Likely, per NETCOM history sources] — https://en.wikipedia.org/wiki/Army_Network_Enterprise_Technology_Command, https://www.globalsecurity.org/military/agency/army/netcom-history.htm

Routing history

announced a single IPv4 block, 155.85.163.0/24, continuously from 2014-06-06 to 2026-03-20 (RIPEstat routing-status first_seen/last_seen); zero prefixes announced as of this research pass (2026-07-17)

[Confirmed] — https://stat.ripe.net/data/routing-status/data.json?resource=615, https://bgp.he.net/AS615

Routing/peering (current)

not seen by any of 327 RIS v4 peers or 322 RIS v6 peers; CAIDA degree total 0 (customer 0, peer 0, provider 0); no current upstreams [Confirmed]. Historically visible with one IPv4 peer, AS1733 (US DoD), per bgp.he.net's last-recorded topology

[Likely] — https://stat.ripe.net, https://api.asrank.caida.org/v2/restful/asns/615, https://bgp.he.net/AS615

RPKI

not assessable — no prefix is currently announced to validate against a ROA; RIPEstat's rpki-validation endpoint requires a prefix and was skipped [Confirmed] — https://stat.ripe.net

CAIDA AS rank

79,459 [Confirmed] — https://api.asrank.caida.org/v2/restful/asns/615

Related ASNs

none confirmed in this pass; the one historical peer identified, AS1733 (US DoD), is not established as operator-affiliated [Unknown]

Admin/abuse/tech contact

DISA-Columbus (Defense Information Systems Agency), handle REGIS10-ARIN, 300 North James Road, Whitehall, OH 43213; disa.columbus.ns.mbx.arin-registrations@mail.mil [Confirmed] — https://rdap.arin.net/registry/autnum/615

Current size

0 IPv4 prefixes / 0 addresses, 0 IPv6 prefixes; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — https://api.asrank.caida.org/v2/restful/asns/615, RIPEstat routing-status

Community/NANOG signal

none found; USAISC's reported 1996 inactivation may explain the absence of recent community discussion [Unknown] — https://en.wikipedia.org/wiki/Army_Network_Enterprise_Technology_Command