asn.dev

Autonomous system

AS121 DNIC-AS-00121

Unclassified ARIN

IPv4 addresses 9.73K 3 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Flagged prefixes 0 none

Summary

US Department of Defense

United States · AI-generated

government military legacy

A US Department of Defense network (DNIC-AS-00121), registered through the

Defense Network Information Center (DNIC), which holds many federal ASNs.

What it's used for

  • US government / military networking.

Notable

  • A US DoD allocation, not a commercial ISP or host. The low AS number, and the DNIC registration, mark it as an early-internet allocation to the federal government.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.

Address space

Summary

Full explorer
CountryNamePrefixes
USUnited States of America3

Registry

Allocation record

via ARIN RDAP
Registry
ARIN
Handle
AS121
Registry name
DNIC-AS-00121
Registrant
United States Department of Defense (DoD)
Abuse contact
disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
Registered
1987-08-13
Last changed
2025-09-12
Status
active

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

No IC3 indicators Nothing from the FBI IC3 feed.

Threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check