Autonomous system
AS306 DNIC-ASBLK-00306-00371
Unclassified ARIN
Summary
US Department of Defense
government legacy military
An early US Department of Defense allocation from the block DNIC-ASBLK-00306-00371, registered to the DoD Network Information Center (DNIC).
What it's used for
- US government / military network operations. The specific site or unit is not publicly identified in the block registration.
Notable
- A government / DoD network, not a commercial ISP or host. It sits in a contiguous block of low-numbered ASNs (00306–00371) held by the DoD Network Information Center from the internet's earliest years, and announces a large amount of address space.
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.
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
IPv4 754 prefixes · 4.49M addresses IPv6 54 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 808 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS306- Registry name
- DNIC-ASBLK-00306-00371
- Registrant
- United States Department of Defense (DoD)
- Abuse contact
- disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
- Registered
- 1989-06-30
- Last changed
- 2025-09-12
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 332 with no ROA
- ROAs
- 0 authorising AS306
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 332 announcements
- Route objects
- 0 naming AS306
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