Autonomous System

AS637 United States Department of Defense (DoD)

GovernmentActiveUnited StatesARIN

AS637 (DNIC-ASBLK-00616-00665) is a government network operated by United States Department of Defense (DoD) in United States, registered with ARIN. It has 527 IPv4 prefixes with 1,034,752 addresses, which makes it the 431st largest of 82,141 active autonomous systems by IPv4 space.

IPv4 addresses1,034,752in 527 prefixes
IPv6 prefixes0none
Size rank#431of 82,141 active ASNs
Abuser scoreVery Lowunder 0.01% of its addresses flagged · method

Details

OrganizationUnited States Department of Defense (DoD)
AS nameDNIC-ASBLK-00616-00665
Websitedefense.gov
Country United States (US)
Network typeGovernment
RegistryARIN
Abuse contactdisa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
Registered1990-04-19
Last updated2025-09-12

IPv4 prefixes

527 prefixes · 1,034,752 addresses
NetworkAddressesFirst – last address
138.156.0.0/1665,536138.156.0.0 – 138.156.255.255
138.158.0.0/1665,536138.158.0.0 – 138.158.255.255
138.168.0.0/1665,536138.168.0.0 – 138.168.255.255
158.237.0.0/1665,536158.237.0.0 – 158.237.255.255
158.238.0.0/1665,536158.238.0.0 – 158.238.255.255
158.243.0.0/1665,536158.243.0.0 – 158.243.255.255
158.245.0.0/1665,536158.245.0.0 – 158.245.255.255
158.236.0.0/1732,768158.236.0.0 – 158.236.127.255
158.236.128.0/1732,768158.236.128.0 – 158.236.255.255
158.239.128.0/1732,768158.239.128.0 – 158.239.255.255
158.239.64.0/1816,384158.239.64.0 – 158.239.127.255
158.239.192.0/1816,384158.239.192.0 – 158.239.255.255
158.244.0.0/1816,384158.244.0.0 – 158.244.63.255
158.244.64.0/1816,384158.244.64.0 – 158.244.127.255
158.244.128.0/1816,384158.244.128.0 – 158.244.191.255
158.245.128.0/1816,384158.245.128.0 – 158.245.191.255
214.44.192.0/1816,384214.44.192.0 – 214.44.255.255
138.157.0.0/198,192138.157.0.0 – 138.157.31.255
158.239.32.0/198,192158.239.32.0 – 158.239.63.255
205.109.128.0/198,192205.109.128.0 – 205.109.159.255
205.109.160.0/198,192205.109.160.0 – 205.109.191.255
205.109.192.0/198,192205.109.192.0 – 205.109.223.255
205.109.224.0/198,192205.109.224.0 – 205.109.255.255
214.44.32.0/198,192214.44.32.0 – 214.44.63.255
214.44.160.0/198,192214.44.160.0 – 214.44.191.255
The 25 largest of 527. The API and the database have all of them.

IPv6 prefixes

No IPv6 prefixes.

Query AS637 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=AS637&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS637, with or without a key:

curl "https://api.ipapi.is/?q=138.156.0.1"

Other networks of United States Department of Defense (DoD)

6 of 108
AS749 United States Department of Defense (DoD)227,398,912 IPv4 addressesAS721 United States Department of Defense (DoD)72,922,368 IPv4 addressesAS56 United States Department of Defense (DoD)8,089,600 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)2,300,416 IPv4 addresses

Largest networks in United States

AS749 United States Department of Defense (DoD)227,398,912 IPv4 addressesAS16509 Amazon.com, Inc.217,931,264 IPv4 addressesAS7018 AT&T Enterprises, LLC117,261,568 IPv4 addressesAS8075 Microsoft Corporation81,468,160 IPv4 addressesAS721 United States Department of Defense (DoD)72,922,368 IPv4 addressesAS7922 Comcast Cable Communications, LLC68,336,896 IPv4 addresses