asn.dev

Autonomous system

AS27137 DNIC-ASBLK-27032-27159

Unclassified ARIN

IPv4 addresses 512 2 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 1 1 downstream
Flagged prefixes 0 none

Summary

United States Department of Defense

United States of America · AI-generated

government military defense network

DNIC-ASBLK-27032-27159 is held by the United States Department of Defense (DoD).

What it's used for

  • The address space carries DoD military network operations, with registrants including Air Force Systems Networking and Navy Network Information Center (NNIC).
  • The AS announces 9728 IPv4 addresses across 24 prefixes with only 2 observed neighbours, indicating a highly segmented internal corporate estate rather than a transit or access network.

Notable

  • Registrants align with the DoD announcer, specifically DoD Network Information Center, Air Force Systems Networking, and Navy Network Information Center (NNIC).
  • The inventory consists of 24 IPv4 prefixes with no IPv6 prefixes, showing a finely subdivided address space typical of internal military site segmentation.

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 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS27066United States Department of Defense (DoD)118

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-20, 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 2 prefixes · 512 addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America2

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS27032
Registry name
DNIC-ASBLK-27032-27159
Registrant
United States Department of Defense (DoD)
Abuse contact
disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
Registered
2003-01-16
Last changed
2025-09-12
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 2 with no ROA
ROAs
0 authorising AS27137
ASPA
no ASPA record
IRR
0% registered · 0 of 2 announcements 1 other origin
Route objects
5 naming AS27137

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 2026-10-21. 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