Data as of Nov 10, 2026
21.0.0.0/8
No anonymizer spaceUnited States Department of Defense (DoD)
Announcements
More specific
Announcements inside
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 21.23.4.0/24 since Sep 2021 | AS749 | Business | United States Department of Defense (DoD) via DoD Network Information Center | |
| 21.23.7.0/24 since Sep 2021 | AS749 | Business | United States Department of Defense (DoD) via DoD Network Information Center | |
| 21.23.13.0/24 since Sep 2021 | AS749 | Business | United States Department of Defense (DoD) via DoD Network Information Center | |
| 21.68.124.0/24 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
Who has announced this prefix
Summary
Routing history
- Pattern
- Rotating
- First seen
- Apr 2021
- Current origin since
- Sep 2021 · 5.2 yr
- Origin networks
- 3
- Last change of origin
- Aug 2022
Recorded history
History
- Handoffs
- 2
IRR inside
Route objects inside
| Prefix | Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|---|
| 21.1.21.0/24 | AS132537 | RADB | Proxy-registered route object | MAINT-HGC-INTL | Oct 2, 2026 |
| 21.89.43.0/24 | AS23682 | RADB | Relianca Customer Pacenet | MAINT-AS18101 | Nov 13, 2023 |
| 21.104.161.0/24 | AS38410 | RADB | Pocheon education office | MAINT-AS4766 | Nov 13, 2023 |
| 21.108.67.0/24 | AS45402 | RADB | SAMSUNG LIFE SERVICE CENTER(Customer Route) | MAINT-AS6619 | Nov 13, 2023 |
| 21.116.64.0/18 | AS17854 | RADB | Proxy-registered route object | MAINT-AS3491 | Mar 28, 2025 |
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