Data as of Nov 11, 2026
155.19.4.0/22
No anonymizer space · no proxy exits in 30 daysHeadquarters, USAISC · reallocated from United States Department of Defense (DoD)
Announcement
this exact prefix
No RPKI
Announced by
Type
Business
Risk
30 / 100 · Medium
Recently moved
Recent change
New origin Oct 16, 2026
from AS367 United States Department of Defense (DoD)
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 155.19.0.0/21 since Jul 2026 | AS1540 | Business | United States Department of Defense (DoD) via Headquarters, USAISC |
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 |
|---|---|---|---|---|---|---|
| 155.19.0.0/16 | 65,536 | CTNOSC-NET6 | United States Department of Defense (DoD) (USDDD) · US | Direct Allocation | Oct 28, 1991 | disa. |
| └ 155.19.0.0/16 | 65,536 | CTNOSC-NET6 | Headquarters, USAISC (HEADQU-3) · US | Reallocated | Aug 22, 2025 | — |
Network & registry
Registry
Holder
- Organization
- United States Department of Defense (DoD)
- Handle
- USDDD
- Range
- 155.
19. 0. 0/ 16 - Registration type
- Direct Allocation
- Record created
- Oct 28, 1991
- Legacy
- yes
- Reallocated to
- Headquarters, USAISC (HEADQU-3)
- Reallocated
- Aug 22, 2025
Origin network
AS1540
US
- Name
- Headquarters, USAISC
- Type
- Business
- Registered
- May 12, 2004
- 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
- Aug 2016
- Current origin since
- Oct 16, 2026 · under a month
- Origin networks
- 4
- Last change of origin
- Oct 16, 2026
Recorded history
History
- Handoffs
- 3
Whois
Registration for this announcement
- Range
- 155.
19. 0. 0/ 16 - Netname
- CTNOSC-NET6
- Registrant
- Headquarters, USAISC
- Organization
- Headquarters, USAISC (HEADQU-3)
- Org address
- NETC-ANC CONUS TNOSC, Fort Huachuca, AZ, 85613
- Org country
- US
- Type
- Reallocated
- Handle
- NET-155-19-0-0-2
- Parent
- NET-155-19-0-0-1
- Created
- Aug 22, 2025
- RIR
- ARIN
- Country
- US
- Delegated
- Oct 28, 1991
- Status
- assigned
Report abuse
Abuse contact
- nobody@
example. com - Name
- No, Contact Known
- Phone
- +1-800-555-1234
- Handle
- CKN23-ARIN