LAYER3 INTEL
Get started
Sign in
Data as of Nov 3, 2026

155.21.16.0/22

No anonymizer space · no proxy exits in 30 days

Headquarters, USAISC · reallocated from United States Department of Defense (DoD)

Announcement
this exact prefix
No RPKI
Announced by
AS1540
Type
Business
Risk
30 / 100 · Medium
Recently moved
Recent change
New origin Oct 16, 2026
from AS367 United States Department of Defense (DoD)

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.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
155.21.0.0/1665,536ASYSMODUnited States Department of Defense (DoD) (USDDD) · USDirect AllocationOct 28, 1991[email protected]
└ 155.21.0.0/1665,536ASYSMODHeadquarters, USAISC (HEADQU-3) · USReallocatedAug 22, 2025—

Network & registry

AnnouncementRouting historyWhois & abuse
Registry

Holder

Organization
United States Department of Defense (DoD)
Handle
USDDD
Range
155.21.0.0/16
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