asn.dev

Autonomous system

AS5974 AS5974

Unclassified ARIN

IPv4 addresses 92.67K 27 prefixes
IPv6 prefixes 3 counted as prefixes, not addresses
Countries 1 mostly Unknown
Exchanges 0 recorded by PCH
Upstreams 1 1 downstream
Flagged prefixes 0 none

Summary

US Department of Defense — DISA Computing Services

United States · AI-generated

government military legacy

A US Department of Defense network from the block DNIC-ASBLK-05800-06055, registered to the DoD Network Information Center (DNIC). Its space is used by the Defense Information Systems Agency (DISA) Computing Services Directorate — reverse DNS across several of its ranges resolves under csd.disa.mil.

What it's used for

  • Enterprise data-centre and application hosting for DoD components. DISA's Computing Services Directorate runs the Defense Enterprise Computing Centers (DECCs), which provide processing, storage and systems management for the services, agencies and combatant commands.
  • Its largest block, 131.77.0.0/16, is registered under the netname DECC-OGDEN — the DECC at Hill Air Force Base, Utah.

Notable

  • A government / DoD network. Functionally this is hosting, but it is government-operated infrastructure serving DoD, not a commercial provider.
  • The inventory mixes legacy /16s (131.77, 156.112) with 214.x space from the DoD-held /8s, plus a few IPv6 /48s.
  • Part of a contiguous run of ASNs (5800–6055) held by the DoD Network Information Center.

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

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

1 upstream, 1 downstream and 4 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS27064United States Department of Defense (DoD)1,062

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-21, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 27 prefixes · 92.67K addresses IPv6 3 prefixes

CountryNamePrefixes
Unknown30

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS5800
Registry name
DNIC-ASBLK-05800-06055
Registrant
United States Department of Defense (DoD)
Abuse contact
disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
Registered
1995-10-24
Last changed
2025-09-12
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 19 with no ROA
ROAs
0 authorising AS5974
ASPA
no ASPA record
IRR
0% registered · 0 of 19 announcements
Route objects
0 naming AS5974

Reputation

Classification and threat

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

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,779 prefixes, as published 2026-10-22. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check