Autonomous System

AS138 United States Department of Defense (DoD)

GovernmentActiveUnited StatesARIN

AS138 (DNIC-AS-00138) is a government network operated by United States Department of Defense (DoD) in United States, registered with ARIN. It has 20 IPv4 prefixes with 26,368 addresses, which makes it the 5,880th largest of 82,534 active autonomous systems by IPv4 space.

IPv4 addresses26,368in 20 prefixes
IPv6 prefixes0none
Size rank#5,880of 82,534 active ASNs
Abuser scoreVery Lowunder 0.01% of its addresses flagged · method

Details

OrganizationUnited States Department of Defense (DoD)
AS nameDNIC-AS-00138
Websitedefense.gov
Country United States (US)
Network typeGovernment
RegistryARIN
Abuse contactdisa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
Registered1987-11-11
Last updated2025-09-12

IPv4 prefixes

20 prefixes · 26,368 addresses
NetworkAddressesFirst – last address
141.234.0.0/1816,384141.234.0.0 – 141.234.63.255
144.183.200.0/212,048144.183.200.0 – 144.183.207.255
131.66.44.0/221,024131.66.44.0 – 131.66.47.255
131.66.48.0/221,024131.66.48.0 – 131.66.51.255
144.183.32.0/221,024144.183.32.0 – 144.183.35.255
144.183.196.0/221,024144.183.196.0 – 144.183.199.255
144.183.128.0/23512144.183.128.0 – 144.183.129.255
131.66.246.0/24256131.66.246.0 – 131.66.246.255
131.66.249.0/24256131.66.249.0 – 131.66.249.255
131.66.250.0/24256131.66.250.0 – 131.66.250.255
131.66.251.0/24256131.66.251.0 – 131.66.251.255
131.66.252.0/24256131.66.252.0 – 131.66.252.255
144.183.15.0/24256144.183.15.0 – 144.183.15.255
144.183.16.0/24256144.183.16.0 – 144.183.16.255
144.183.17.0/24256144.183.17.0 – 144.183.17.255
144.183.20.0/24256144.183.20.0 – 144.183.20.255
144.183.127.0/24256144.183.127.0 – 144.183.127.255
144.183.130.0/24256144.183.130.0 – 144.183.130.255
144.183.131.0/24256144.183.131.0 – 144.183.131.255
144.183.227.0/24256144.183.227.0 – 144.183.227.255

IPv6 prefixes

No IPv6 prefixes.

Query AS138 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=AS138&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS138, with or without a key:

curl "https://api.ipapi.is/?q=141.234.0.1"

Other networks of United States Department of Defense (DoD)

6 of 111
AS749 United States Department of Defense (DoD)227,398,400 IPv4 addressesAS721 United States Department of Defense (DoD)72,988,160 IPv4 addressesAS56 United States Department of Defense (DoD)8,089,856 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)2,303,488 IPv4 addresses

Largest networks in United States

AS749 United States Department of Defense (DoD)227,398,400 IPv4 addressesAS16509 Amazon.com, Inc.218,442,752 IPv4 addressesAS7018 AT&T Enterprises, LLC117,260,800 IPv4 addressesAS8075 Microsoft Corporation81,466,624 IPv4 addressesAS721 United States Department of Defense (DoD)72,988,160 IPv4 addressesAS7922 Comcast Cable Communications, LLC68,337,664 IPv4 addresses