Data as of Nov 3, 2026
137.4.0.0/16
No anonymizer space · no proxy exits in 30 daysUnited States Department of Defense (DoD)
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | RPKI |
|---|---|---|---|
| 137.0.0.0/13 since Dec 2010 | AS721 | Business |
More specific
Announcements inside
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 137.4.120.0/24 since Feb 2026 | AS56 | Business | United States Department of Defense (DoD) via Air Force Systems Networking |
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 |
|---|---|---|---|---|---|---|
| 137.4.0.0/16 | 65,536 | CHARLESTON | United States Department of Defense (DoD) (USDDD) · US | Direct Allocation | Feb 14, 1997 | [email protected] |
| └ 137.4.0.0/16 | 65,536 | CHARLESTON | Air Force Systems Networking (7ESG) · US | Reallocated | Aug 19, 2025 | [email protected] |
Network & registry
Registry
Holder
- Organization
- United States Department of Defense (DoD)
- Handle
- USDDD
- Range
- 137.4.0.0/16
- Registration type
- Direct Allocation
- Record created
- Feb 14, 1997
- Legacy
- yes
- Reallocated to
- Air Force Systems Networking (7ESG)
- Reallocated
- Aug 19, 2025
Origin network
AS56
US
- Name
- United States Department of Defense (DoD)
- Type
- Business
- Registered
- Dec 18, 1985
- Domain
- mail.mil
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Rotating
- First seen
- May 2005
- Current origin since
- Sep 2025 · 1.1 yr
- Origin networks
- 6
- Last change of origin
- Sep 2025
Recorded history
History
- Handoffs
- 5
Whois
Registration for this announcement
- Range
- 137.4.0.0/16
- Netname
- CHARLESTON
- Registrant
- Air Force Systems Networking
- Organization
- Air Force Systems Networking (7ESG)
- Org address
- 501 EAST MOORE DR. BLDG 884 RM 1100 GUNTHER ANNEX, MAXWELL AFB, AL, 36114
- Org country
- US
- Type
- Reallocated
- Handle
- NET-137-4-0-0-2
- Parent
- NET-137-4-0-0-1
- Created
- Aug 19, 2025
- RIR
- ARIN
- Country
- US
- Delegated
- Feb 14, 1997
- Status
- assigned
Report abuse
Abuse contact
- [email protected]
- Name
- No, Contact Known
- Phone
- +1-800-555-1234
- Handle
- CKN23-ARIN