Autonomous system detail

AS66

Not announced

Operated by DNIC-AS-00066 - Headquarters, USAISC.

Summary

// analyst note
A registered-but-dormant U.S. Army DNIC number; an origin in live BGP would be anomalous. The historical 'ETL-AI' label does not match the current DNIC ASName.
// security note
NEUTRAL/DATED: dormant/not announcing; no abuse signal as of 2026-06-08.
IPv4 prefixes
0
~0 addresses
IPv6 prefixes
0
—
Peer networks
0
0 up · 0 down
IANA block
1-1876
Assigned by ARIN
[ 01 ] — Context

About this ASN.

Updated  ·  Confidence: High

AS66 is a legacy DNIC-style U.S. military allocation registered under ARIN to Headquarters, USAISC (the U.S. Army Information Systems Command), administered under the org HEADQU-3 at Fort Huachuca, AZ. RFC 1020 (1987) lists AS66 as "ETL-AI" — associated with the Army Engineer Topographic Laboratories' AI work — so the historical label does not match the current DNIC ASName; the holder is now the Army's consolidated HEADQU-3 org. The ASN is dormant: it is not visible in the global routing table, originates zero IPv4/IPv6 prefixes, and shows no peers or upstreams, which is typical of registered-but-dormant DoD DNIC numbers. The ARIN ASN RegDate is 1986-03-18 (the HEADQU-3 org RegDate is 1990-03-26). HEADQU-3 holds a large pool of Army DNIC ASNs (AS13, AS51, AS54, AS252, AS666, AS672, AS1516, AS1649). For triage, treat AS66 as a registered-but-dormant Army number; an origin in live BGP would be anomalous. No notable public abuse signal was found as of June 2026.

Operator
Headquarters, USAISC (U.S. Army Information Systems Command; ARIN OrgId HEADQU-3, Fort Huachuca, AZ 85613) [Confirmed] — ARIN RDAP
Country / RIR
US, ARIN [Confirmed]
Allocated
ARIN ASN RegDate 1986-03-18 (updated 2011-08-02; org HEADQU-3 RegDate 1990-03-26) [Confirmed]
Org status
registered but dormant

Security/abuse context (NEUTRAL, DATED)

dormant/not announcing; no abuse signal as of 2026-06-08 — bgp.tools

Network & routing

Network type
government / military (U.S. Army) [Confirmed]
Size
dormant — 0 IPv4 / 0 IPv6 prefixes; not visible in the routing table — IP2Location / PeeringDB / IPinfo (2026-06)
Routing/peering
none — no peers or upstreams; RPKI n/a — bgp.tools
Notable usage
[historical, RFC 1020] AS66 "ETL-AI" (Army Engineer Topographic Laboratories AI work). [current] U.S. Army HEADQU-3 org with DNIC naming convention — army.mil
Related ASNs
HEADQU-3 pool — AS13, AS51, AS54, AS252, AS666, AS672, AS1516, AS1649 [Confirmed]
Analyst note
A registered-but-dormant U.S. Army DNIC number; an origin in live BGP would be anomalous. Historical "ETL-AI" label does not match the current DNIC ASName.
[ 02 ] — Announced prefixes

What this network routes.

0 prefixes total · RIPEstat data · cached, not real-time
// IPv4 prefixes0
No IPv4 prefixes announced.
// IPv6 prefixes0
No IPv6 prefixes announced.
[ 03 ] — Notable peers & upstreams

Who it talks to.

0 observed neighbours
Neighbour data unavailable from public BGP collectors.