Data as of Nov 12, 2026
21.23.4.0/24
No anonymizer space · no proxy exits in 30 daysUnited States Department of Defense (DoD)
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 21.0.0.0/8 since Sep 2021 | AS749 | Business | United States Department of Defense (DoD) via DoD Network Information Center |
Registrations in this block
The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 21.0.0.0/8 | 16,777,216 | DNIC-SNET-021 | United States Department of Defense (DoD) (USDDD) · US | Direct Allocation | Jul 1, 1991 | disa. |
| └ 21.0.0.0/8 | 16,777,216 | DNIC-SNET-021 | DoD Network Information Center (DNIC) · US | Reallocated | Sep 5, 2025 | disa. |
Network & registry
Registry
Holder
- Organization
- United States Department of Defense (DoD)
- Handle
- USDDD
- Range
- 21.
0. 0. 0/ 8 - Registration type
- Direct Allocation
- Record created
- Jul 1, 1991
- Legacy
- yes
- Reallocated to
- DoD Network Information Center (DNIC)
- Reallocated
- Sep 5, 2025
Origin network
AS749
US
- Name
- United States Department of Defense (DoD)
- Type
- Business
- Domain
- mail.mil
- Industry
- Military, Defense, National Security, and International Affairs
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Aug 2021
- Current origin since
- Sep 2021 · 5.1 yr
- Origin networks
- 2
- Last change of origin
- Sep 2021
Recorded history
History
- Handoffs
- 1
Whois
Registration for this announcement
- Range
- 21.
0. 0. 0/ 8 - Netname
- DNIC-SNET-021
- Registrant
- DoD Network Information Center
- Organization
- DoD Network Information Center (DNIC)
- Org address
- 3990 E. Broad Street, Columbus, OH, 43218
- Org country
- US
- Type
- Reallocated
- Handle
- NET-21-0-0-0-2
- Parent
- NET-21-0-0-0-1
- Created
- Sep 5, 2025
- RIR
- ARIN
- Country
- US
- Delegated
- Jul 1, 1991
- Status
- assigned
Report abuse
Abuse contact
- disa.
columbus. ns. mbx. hostmaster-dod-nic@ mail. mil - Name
- Network DoD
- Phone
- +1-844-347-2457
- Handle
- MIL-HSTMST-ARIN