Autonomous system detail

AS39

Not announced

Operated by DNIC-AS-00039 - United States Department of Defense (DoD).

Summary

// analyst note
A dormant DoD-held legacy number; flag the NRL→DoD/DNIC divergence explicitly. Active DoD networks live under other ASNs (e.g., AS27066, AS668/DREN), not AS39.
// security note
NEUTRAL/DATED: government allocation; no notable public abuse signal found 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

AS39 is a legacy U.S. government allocation registered under ARIN to the United States Department of Defense (DoD Network Information Center), under the DNIC-AS-XXXXX numbering scheme the Defense Department uses to consolidate legacy military ASNs. RFC 1020 (1987) originally labeled AS39 "NRL-ITD," the U.S. Naval Research Laboratory's Information Technology Division, so this is an explicit historical→current reassignment from NRL to the DoD NIC. The ASN appears dormant in 2026: no known IP addresses, peers, upstreams, or downstreams are observed, and it is not originating routes. For triage, this is a dormant DoD-held legacy number; the NRL→DoD/DNIC divergence should be flagged, and active DoD networks live under other ASNs (for example AS27066, or AS668/DREN), not AS39. The ARIN ASN RegDate of 1985-02-08 is the registry date (updated 2011-07-05). No notable public abuse signal was found as of June 2026.

Operator
United States Department of Defense (DoD Network Information Center / DNIC; ARIN) [Confirmed] — ARIN RDAP
Country / RIR
US, ARIN [Confirmed]
Allocated
ARIN ASN RegDate 1985-02-08 (registry date; updated 2011-07-05) [Confirmed]
Org status
organization active, ASN dormant

Security/abuse context (NEUTRAL, DATED)

government allocation; no notable public abuse signal found as of 2026-06-08 — ipgeolocation.io

Network & routing

Network type
government / military [Confirmed]
Size
appears dormant; no known IPs/prefixes — ipgeolocation.io / ARIN (2026-06)
Routing/peering
none — no peers, upstreams, or downstreams; not originating routes; RPKI none — ipgeolocation.io
Notable usage
[historical, RFC 1020] AS39 "NRL-ITD" = U.S. Naval Research Laboratory, Information Technology Division. [current] registered to the DoD Network Information Center (DNIC) — defense.gov
Related ASNs
broader DoD DNIC-AS series; active DoD networks on other ASNs (e.g., AS27066, AS668/DREN) [Confirmed]
Analyst note
A dormant DoD-held legacy number; flag the NRL→DoD/DNIC divergence explicitly. Active DoD networks live under other ASNs, not AS39.
[ 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.