AS721 — DNIC-ASBLK-00721-00726

AS721 announces 5,345 IPv4 prefixes covering 29,627,648 addresses and 50 IPv6 prefixes.

About this network

A US Department of Defense allocation, part of the ASN block DNIC-ASBLK-00721-00726 registered to the DoD Network Information Center (DNIC).

What it's used for

• US Department of Defense networking.

Notable

• A US government / DoD network, not a commercial ISP or host. Registered to the DoD Network Information Center (DNIC), which holds many federal ASNs. The low AS number reflects an early-internet allocation.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 6.16.172.0/23
• 6.16.174.0/24
• 6.64.181.0/24
• 55.0.0.0/16
• 55.9.0.0/16
• 55.12.0.0/16
• 55.14.0.0/16
• 55.21.0.0/16
• 55.29.0.0/16
• 55.31.0.0/16
• 55.33.0.0/16
• 55.57.0.0/16
• 55.66.0.0/16
• 55.80.0.0/15
• 55.101.0.0/16
• 55.102.0.0/15
• 55.104.0.0/13
• 55.112.0.0/12
• 55.128.0.0/11
• 55.160.0.0/12
• 55.176.0.0/15
• 55.178.0.0/16
• 55.179.0.0/17
• 55.179.128.0/20
• 55.179.146.0/23
• 55.179.148.0/22
• 55.179.152.0/21
• 55.179.160.0/19
• 55.179.192.0/19
• 55.179.224.0/22
• 55.179.228.0/23
• 55.179.237.0/24
• 55.179.238.0/23
• 55.179.240.0/20
• 55.180.0.0/14
• 55.184.0.0/14
• 55.189.37.0/24
• 55.189.38.0/23
• 55.189.48.0/21
• 55.189.56.0/23
• 55.189.60.0/22
• 55.189.97.0/24
• 55.189.98.0/23
• 55.189.100.0/22
• 55.189.104.0/21
• 55.189.112.0/20
• 55.189.128.0/19
• 55.189.160.0/20
• 55.189.176.0/22
• 55.189.181.0/24
• 55.189.182.0/23
• 55.189.184.0/21
• 55.189.192.0/18
• 55.190.0.0/23
• 55.190.4.0/22
• 55.190.9.0/24
• 55.190.10.0/23
• 55.190.12.0/22
• 55.190.16.0/20
• 55.190.32.0/19
• 55.190.64.0/20
• 55.190.81.0/24
• 55.190.83.0/24
• 55.190.86.0/23
• 55.190.89.0/24
• 55.190.90.0/23
• 55.190.92.0/22
• 55.190.96.0/24
• 55.190.98.0/23
• 55.190.100.0/22
• 55.190.104.0/21
• 55.190.112.0/20
• 55.190.128.0/18
• 55.190.192.0/21
• 55.190.201.0/24
• 55.190.202.0/23
• 55.190.204.0/22
• 55.190.208.0/20
• 55.190.224.0/20
• 55.190.240.0/21
• 55.190.248.0/22
• 55.190.252.0/23
• 55.190.255.0/24
• 55.192.0.0/15
• 55.197.0.0/16
• 55.198.0.0/15
• 55.200.0.0/13
• 55.208.0.0/16
• 55.209.0.0/18
• 55.209.64.0/19
• 55.209.96.0/22
• 55.209.101.0/24
• 55.209.102.0/23
• 55.209.104.0/21
• 55.209.112.0/20
• 55.209.128.0/18
• 55.209.192.0/21
• 55.209.204.0/22
• 55.209.208.0/20
• 55.209.224.0/19

and 5,295 more.

Upstream networks

• AS3356 Level 3 Parent, LLC

Downstream networks

• AS27064 United States Department of Defense (DoD)
• AS27066 United States Department of Defense (DoD)
• AS27065 United States Department of Defense (DoD)

Adjacent networks

• AS3356 Level 3 Parent, LLC
• AS27064 United States Department of Defense (DoD)
• AS27066 United States Department of Defense (DoD)
• AS27065 United States Department of Defense (DoD)