Autonomous system
AS5371 AS5371
Unclassified ARIN
Summary
US Department of Defense
government military legacy
A US Department of Defense network from the block DNIC-ASBLK-05120-05376, registered to the DoD Network Information Center (DNIC).
What it's used for
- Operational US Navy networking, and at considerable scale: it originates hundreds of prefixes, essentially all from legacy
205.xspace registered to the Navy Network Information Center (NNIC).
Notable
- A government / military network, not a commercial ISP or host.
- One of the busiest ASNs in the DNIC block by prefix count, announcing many small blocks rather than a few large ones — a pattern that fits a network stitched together from many separately assigned sites.
- The ASN registration is generic to the DoD block, so no specific command or installation is publicly identified.
Interesting
- The Navy's address space is spread across a great many small legacy blocks rather than consolidated into a few aggregates, which is why a single Navy ASN can end up carrying a routing table entry count out of proportion to the amount of address space it actually holds.
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
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.
| AS | Network | Paths seen |
|---|---|---|
| AS27064 | United States Department of Defense (DoD) | 14,254 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-24, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 198 prefixes · 197K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| Unknown | 198 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS5120- Registry name
- DNIC-ASBLK-05120-05376
- Registrant
- United States Department of Defense (DoD)
- Abuse contact
- disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
- Registered
- 1995-05-09
- Last changed
- 2026-09-25
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 263 with no ROA
- ROAs
- 0 authorising AS5371
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 263 announcements
- Route objects
- 0 naming AS5371
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 2026-10-24. 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