All ASNs

Autonomous System details for AS721

AS721

United States Department of Defense (DoD) • mail.mil

AS721 — United States Department of Defense (DoD)

AS Name

DNIC-ASBLK-00721-00726

Country

United States (US)

Website

mail.mil

Number of IPv4

73,133,568

Number of IPv6

1.58 × 10²⁹

ASN type

Government

Status

Assigned

Registry

ARIN

Allocated

Last updated

September 12, 2025

IP Ranges

237 IPv4 prefixes, 2 IPv6 prefixes

Prefix	Company	Number of IPs
6.16.172.0/23	Headquarters, USAISC	512
6.16.174.0/24	Headquarters, USAISC	256
6.64.181.0/24	Headquarters, USAISC	256
55.0.0.0/8	Headquarters, USAISC	16,777,216
130.22.0.0/16	Department of Immigration	65,536
131.4.0.0/15	Air Force Systems Networking	131,072
131.16.0.0/16	Air Force Systems Networking	65,536
131.32.0.0/11	Air Force Systems Networking	2,097,152
131.64.0.0/13	Department of Immigration	524,288
131.73.0.0/16	Department of Immigration	65,536
131.74.0.0/15	Department of Immigration	131,072
131.76.0.0/14	Department of Immigration	262,144
131.78.3.0/24	Department of Immigration	256
131.78.204.0/24	Department of Immigration	256
131.80.0.0/14	Department of Immigration	262,144
131.86.0.0/15	Department of Immigration	131,072
131.86.0.0/16	Department of Immigration	65,536
131.87.0.0/16	Department of Immigration	65,536
132.0.0.0/10	Air Force Systems Networking	4,194,304
132.80.0.0/12	Headquarters, USAISC	1,048,576
132.96.0.0/11	Headquarters, USAISC	2,097,152
132.128.0.0/12	Headquarters, USAISC	1,048,576
134.80.0.0/16	Headquarters, USAISC	65,536
134.135.0.0/16	Department of Immigration	65,536
134.233.0.0/16	Headquarters, USAISC	65,536
134.235.0.0/16	Headquarters, USAISC	65,536
136.212.0.0/14	Department of Immigration	262,144
136.216.0.0/14	Headquarters, USAISC	262,144
136.220.0.0/15	Headquarters, USAISC	131,072
137.0.0.0/13	Air Force Systems Networking	524,288
137.8.0.0/14		262,144
137.209.0.0/16		65,536
137.240.0.0/14	Air Force Systems Networking	262,144
138.50.0.0/16	Headquarters, USAISC	65,536
138.136.0.0/13		524,288
138.144.0.0/12		1,048,576
138.160.0.0/15		131,072
138.162.5.0/24		256
138.164.0.0/14		262,144
138.168.0.0/14	MARINE CORPS CYBERSPACE OPERATIONS GROUP	262,144
138.178.0.0/15		131,072
138.178.0.0/16		65,536
138.180.0.0/16		65,536
139.139.0.0/16	Headquarters, USAISC	65,536
139.241.0.0/16		65,536
140.1.0.0/16	Department of Immigration	65,536
140.13.73.0/24	Department of Immigration	256
140.14.35.0/24	Department of Immigration	256
140.14.37.0/24	Department of Immigration	256
140.14.39.0/24	Department of Immigration	256
140.14.41.0/24	Department of Immigration	256
140.14.43.0/24	Department of Immigration	256
140.14.45.0/24	Department of Immigration	256
140.14.47.0/24	Department of Immigration	256
140.14.49.0/24	Department of Immigration	256
140.14.51.0/24	Department of Immigration	256
140.14.53.0/24	Department of Immigration	256
140.21.0.0/16	Department of Immigration	65,536
140.35.64.0/18	Department of Immigration	16,384
140.152.0.0/14	Department of Immigration	262,144
140.153.72.0/24	Headquarters, USAISC	256
140.201.0.0/16	Headquarters, USAISC	65,536
141.234.0.0/15		131,072
143.69.0.0/16	Headquarters, USAISC	65,536
143.73.0.0/16	Headquarters, USAISC	65,536
143.74.0.0/16	Headquarters, USAISC	65,536
143.76.0.0/16	Headquarters, USAISC	65,536
143.81.0.0/16	Headquarters, USAISC	65,536
143.81.0.0/17	Headquarters, USAISC	32,768
143.81.103.0/24	Headquarters, USAISC	256
143.81.128.0/17	Headquarters, USAISC	32,768
143.83.0.0/16	Headquarters, USAISC	65,536
143.84.0.0/16	Headquarters, USAISC	65,536
143.85.0.0/16	Headquarters, USAISC	65,536
143.85.0.0/18	Headquarters, USAISC	16,384
143.85.64.0/18	Headquarters, USAISC	16,384
143.85.128.0/18	Headquarters, USAISC	16,384
143.85.192.0/18	Headquarters, USAISC	16,384
143.86.176.0/24	Headquarters, USAISC	256
143.86.204.0/23	Headquarters, USAISC	512
143.138.0.0/15	Headquarters, USAISC	131,072
143.140.0.0/14	Air Force Systems Networking	262,144
143.144.0.0/13	Air Force Systems Networking	524,288
143.156.0.0/15	Air Force Systems Networking	131,072
143.212.0.0/15	Headquarters, USAISC	131,072
144.100.0.0/14	Headquarters, USAISC	262,144
144.104.0.0/14	Headquarters, USAISC	262,144
144.104.0.0/15	Headquarters, USAISC	131,072
144.109.0.0/16	Headquarters, USAISC	65,536
144.170.0.0/16	Headquarters, USAISC	65,536
144.182.0.0/15		131,072
144.251.43.0/24		256
146.55.22.0/23	Headquarters, USAISC	512
146.55.124.0/24	Headquarters, USAISC	256
146.55.127.0/24	Headquarters, USAISC	256
147.130.0.0/15	Headquarters, USAISC	131,072
147.216.0.0/15	Headquarters, USAISC	131,072
148.48.0.0/15		131,072
150.192.0.0/15	Headquarters, USAISC	131,072
153.23.0.0/16	Air Force Systems Networking	65,536
2608:120::/32	United States Department of Defense (DoD)	7.92 × 10²⁸
2608:121::/32	United States Department of Defense (DoD)	7.92 × 10²⁸

This table only shows the first 100 of the set of IPv4 and IPv6 prefixes. All data is available via our IP data API.

IP ranges are the different blocks of IP addresses advertised by an Autonomous System (AS). These ranges can be used by the same organization operating the AS, or by different organizations.

Peers of AS721

0 peers

AS721 has no peers recorded.

Peering is a direct, often free, traffic exchange between Autonomous Systems (ASNs). They share routes only to their own networks and customers, making connections faster and cheaper for that specific traffic, without providing full internet access to each other.

Upstreams of AS721

1 upstreams

AS3356

AS721 uses these Autonomous Systems as its upstreams.

An upstream (or transit provider) is another AS that AS721 pays for full internet connectivity, allowing it to reach all global destinations and be reachable by them.

Downstreams of AS721

3 downstreams

AS27064 AS27065 AS27066

AS721 provides internet connectivity to these downstream Autonomous Systems.

A downstream is a customer Autonomous System that pays another AS (its provider) for internet access. The provider AS carries the downstream's traffic and makes its network reachable.