Autonomous system
AS4221 DNIC-ASBLK-04214-04221
Unclassified ARIN
IPv4 addresses
0
0 prefixes
IPv6 prefixes
2
counted as prefixes, not addresses
Countries
1
mostly US
Flagged prefixes
0
none
Summary
US Department of Defense
government military legacy
Autonomous System 4221 is part of DNIC-ASBLK-04214-04221, a block of AS numbers
registered to the United States Department of Defense.
What it's used for
- DoD network infrastructure. The registration is a generic departmental block and does not identify a specific base, command, or unit.
Notable
- The
DNICprefix refers to the Defense Network Information Center, the registry function that historically administered DoD internet number resources. - DoD holds AS numbers in contiguous blocks like this one rather than requesting them individually, so neighbouring numbers in the 4214-4221 range share the same registration.
- The AS carries no publicly announced IPv4 address space, which is common for DoD numbers reserved for internal or non-public use.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Address space
Summary
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 2 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS4214- Registry name
- DNIC-ASBLK-04214-04221
- Registrant
- United States Department of Defense (DoD)
- Abuse contact
- disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
- Registered
- 1995-01-09
- Last changed
- 2025-09-12
- Status
- active
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
No IC3 indicators Nothing from the FBI IC3 feed.
Threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere