asn.dev

Autonomous system

AS27047 DNIC-ASBLK-27032-27159

Unclassified ARIN

IPv4 addresses 23.30K 36 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

United States Department of Defense

United States of America · AI-generated

government defense dnic ipv4

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

What it's used for

  • The address space is registered under the netname DNIC-SUPERBLK1 with the registrant DoD Network Information Center, indicating internal DoD network operations.
  • The AS announces 15,872 IPv4 addresses across 32 prefixes, all located in the United States of America, with a single observed neighbour, suggesting a self-contained or highly segmented internal estate rather than a transit or access network.

Notable

  • All sampled registrants are consistent with the announcer, identified as DoD Network Information Center.
  • The address inventory consists entirely of IPv4 prefixes within the 164.236.0.0/16 range, subdivided into /21, /22, /23, and /24 blocks, with no IPv6 prefixes in inventory.

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

ASNetworkPaths seen
AS27064United States Department of Defense (DoD)3,419

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 36 prefixes · 23.30K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America36

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, 57 with no ROA
ROAs
0 authorising AS27047
ASPA
no ASPA record
IRR
0% registered · 0 of 57 announcements
Route objects
0 naming AS27047

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