Autonomous System

AS1561 United States Department of Defense (DoD)

GovernmentActiveUnited StatesARIN

AS1561 (DNIC-ASBLK-01550-01601) is a government network operated by United States Department of Defense (DoD) in United States, registered with ARIN. It has 7 IPv4 prefixes with 73,216 addresses, which makes it the 2,887th largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses73,216in 7 prefixes
IPv6 prefixes0none
Size rank#2,887of 82,200 active ASNs
Abuser scoreVery Lowunder 0.01% of its addresses flagged · method

Details

OrganizationUnited States Department of Defense (DoD)
AS nameDNIC-ASBLK-01550-01601
Websitedefense.gov
Country United States (US)
Network typeGovernment
RegistryARIN
Abuse contactdisa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
Registered2006-04-03
Last updated2025-09-12

IPv4 prefixes

7 prefixes · 73,216 addresses
NetworkAddressesFirst – last address
6.126.0.0/1665,5366.126.0.0 – 6.126.255.255
6.126.64.0/204,0966.126.64.0 – 6.126.79.255
6.126.224.0/212,0486.126.224.0 – 6.126.231.255
6.126.6.0/235126.126.6.0 – 6.126.7.255
6.126.8.0/235126.126.8.0 – 6.126.9.255
6.126.2.0/242566.126.2.0 – 6.126.2.255
6.126.225.0/242566.126.225.0 – 6.126.225.255

IPv6 prefixes

No IPv6 prefixes.

Query AS1561 with the API

The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day. 

curl "https://api.ipapi.is/?q=AS1561&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS1561, with or without a key:

curl "https://api.ipapi.is/?q=6.126.0.1"

Other networks of United States Department of Defense (DoD)

6 of 108
AS749 United States Department of Defense (DoD)227,464,192 IPv4 addressesAS721 United States Department of Defense (DoD)73,070,080 IPv4 addressesAS56 United States Department of Defense (DoD)8,082,944 IPv4 addressesAS306 United States Department of Defense (DoD)4,666,880 IPv4 addressesAS668 United States Department of Defense (DoD)2,558,464 IPv4 addressesAS5972 United States Department of Defense (DoD)2,298,624 IPv4 addresses

Largest networks in United States

AS749 United States Department of Defense (DoD)227,464,192 IPv4 addressesAS16509 Amazon.com, Inc.218,038,784 IPv4 addressesAS7018 AT&T Enterprises, LLC117,262,080 IPv4 addressesAS8075 Microsoft Corporation81,463,040 IPv4 addressesAS721 United States Department of Defense (DoD)73,070,080 IPv4 addressesAS7922 Comcast Cable Communications, LLC68,336,896 IPv4 addresses