AS721 United States Department of Defense (DoD)

DNIC-ASBLK-00721-00726 - United States Department of Defense (DoD) · registered in the United States

IPv4 addresses29,541,3765,387 prefixes · 0.943% of announced IPv4

Rank in United States#7largest network in US by IPv4 space, of 18,338 · 2.17% of US

Rank worldwide#12of 79,396 networks with IPv4

IPv61 x /32 (131,064 x /48)59 prefixes

CountryUnited States18,679 ASNs registered there

Open AS721 in ASN lookup Look up an IP in this network (6.16.172.1) All networks in United States

IPv4 prefixes

First 500 of 5,387 prefixes, in address order.

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
55.200.0.0/16
55.201.0.0/17
55.201.128.0/18
55.201.192.0/19
55.201.224.0/20
55.201.240.0/23
55.201.243.0/24
55.201.244.0/22
55.201.248.0/21
55.202.0.0/15
55.204.0.0/14
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
55.209.200.0/23
55.209.204.0/22
55.209.208.0/20
55.209.224.0/19
55.210.0.0/15
55.212.0.0/14
55.216.0.0/13
55.224.0.0/24
55.224.2.0/23
55.224.4.0/23
55.224.6.0/24
55.224.9.0/24
55.224.10.0/23
55.224.32.0/19
55.224.81.0/24
55.224.83.0/24
55.224.84.0/23
55.224.87.0/24
55.224.89.0/24
55.224.90.0/23
55.224.92.0/22
55.224.97.0/24
55.224.99.0/24
55.224.100.0/23
55.224.102.0/24
55.224.104.0/21
55.224.112.0/20
55.224.128.0/24
55.224.135.0/24
55.224.136.0/21
55.224.144.0/20
55.224.160.0/19
55.224.192.0/18
55.225.0.0/16
55.226.0.0/15
55.228.0.0/14
55.232.0.0/13
55.240.0.0/12
130.22.3.0/24
130.22.4.0/23
130.22.6.0/24
130.22.9.0/24
130.22.12.0/22
130.22.16.0/21
130.22.24.0/23
130.22.28.0/22
130.22.37.0/24
130.22.38.0/23
130.22.40.0/21
130.22.58.0/23
130.22.60.0/23
130.22.62.0/24
130.22.67.0/24
130.22.76.0/22
130.22.80.0/21
130.22.91.0/24
130.22.94.0/24
130.22.132.0/22
130.22.136.0/22
130.22.140.0/23
130.22.142.0/24
130.22.151.0/24
130.22.152.0/21
130.22.160.0/23
130.22.164.0/22
130.22.168.0/21
130.22.191.0/24
130.22.194.0/23
130.22.196.0/22
130.22.200.0/21
130.22.208.0/20
130.22.224.0/19
131.4.0.0/16
131.5.0.0/19
131.5.32.0/20
131.5.64.0/18
131.5.128.0/17
131.16.0.0/18
131.16.64.0/20
131.16.88.0/21
131.16.96.0/19
131.16.128.0/17
131.33.0.0/18
131.33.64.0/19
131.33.96.0/20
131.33.112.0/21
131.33.121.0/24
131.33.122.0/23
131.33.124.0/22
131.33.128.0/17
131.41.0.0/16
131.42.0.0/16
131.43.0.0/21
131.43.8.0/24
131.43.12.0/23
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131.43.59.0/24
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131.43.104.0/22
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131.43.156.0/23
131.43.171.0/24
131.43.172.0/22
131.43.176.0/21
131.43.184.0/22
131.43.188.0/23
131.43.204.0/23
131.43.220.0/23
131.43.235.0/24
131.43.236.0/23
131.43.252.0/22
131.54.0.0/16
131.57.0.0/16
131.60.0.0/21
131.60.8.0/23
131.60.12.0/23
131.60.28.0/23
131.60.43.0/24
131.60.44.0/23
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131.60.104.0/22
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131.60.138.0/23
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131.60.156.0/23
131.60.168.0/22
131.60.172.0/23
131.60.187.0/24
131.60.188.0/23
131.60.204.0/23
131.60.221.0/24
131.60.222.0/23
131.60.224.0/20
131.60.248.0/21
131.62.0.0/21
131.62.12.0/24
131.62.26.0/23
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131.62.188.0/23
131.62.204.0/23
131.62.219.0/24
131.62.220.0/22
131.62.224.0/21
131.62.232.0/22
131.62.240.0/20
131.63.0.0/16
131.65.0.0/18
131.65.64.0/19
131.65.96.0/20
131.65.112.0/21
131.65.120.0/23
131.65.224.0/19
131.66.0.0/23
131.66.5.0/24
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131.66.40.0/22
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131.66.61.0/24
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131.66.64.0/19
131.66.96.0/21
131.66.104.0/23
131.66.107.0/24
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131.66.128.0/22
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131.66.144.0/23
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131.66.168.0/21
131.66.176.0/20
131.66.192.0/19
131.66.224.0/20
131.66.240.0/22
131.66.244.0/23
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131.66.253.0/24
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131.67.0.0/22
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131.67.192.0/19
131.67.224.0/22
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131.68.0.0/19
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131.69.64.0/18
131.69.153.0/24
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131.70.0.0/22
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131.70.56.0/22
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131.70.114.0/23
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131.71.224.0/20
131.73.0.0/20
131.73.17.0/24
131.73.18.0/23
131.73.20.0/22
131.73.33.0/24

IPv6 prefixes

All 59 prefixes.

2608:120::/47
2608:120:3::/48
2608:120:5::/48
2608:120:6::/47
2608:120:8::/46
2608:120:d::/48
2608:120:e::/47
2608:120:10::/44
2608:120:20::/43
2608:120:40::/42
2608:120:80::/41
2608:120:100::/40
2608:120:200::/39
2608:120:400::/38
2608:120:800::/37
2608:120:1000::/36
2608:120:2000::/35
2608:120:4000::/35
2608:120:6000::/41
2608:120:6080::/42
2608:120:60c0::/44
2608:120:60d0::/45
2608:120:60d8::/48
2608:120:60da::/47
2608:120:60dc::/46
2608:120:60e0::/43
2608:120:6100::/40
2608:120:6200::/39
2608:120:6400::/38
2608:120:6800::/39
2608:120:6a00::/42
2608:120:6a40::/43
2608:120:6a60::/45
2608:120:6a68::/46
2608:120:6a6d::/48
2608:120:6a6e::/47
2608:120:6a70::/44
2608:120:6a80::/41
2608:120:6b00::/40
2608:120:6c00::/38
2608:120:7000::/36
2608:120:8000::/33
2608:121:2::/47
2608:121:4::/46
2608:121:8::/46
2608:121:d::/48
2608:121:e::/47
2608:121:10::/44
2608:121:20::/43
2608:121:40::/42
2608:121:80::/41
2608:121:100::/40
2608:121:200::/39
2608:121:400::/38
2608:121:800::/37
2608:121:1000::/36
2608:121:2000::/35
2608:121:4000::/34
2608:121:8000::/33

Other ASNs named United States Department of Defense (DoD)

172 other networks use the same organisation name; together with AS721 they announce 282,590,464 IPv4 addresses. Largest 30 shown.

ASNNameIPv4 addresses

AS749DNIC-AS-00749 - United States Department of Defense (DoD) US222,038,272

AS56DNIC-AS-00056 - United States Department of Defense (DoD) US7,785,728

AS306DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD) US4,492,288

AS668DNIC-AS-00668 - United States Department of Defense (DoD) US2,549,504

AS5972DNIC-ASBLK-05800-06055 - United States Department of Defense (DoD) US1,865,472

AS27064DNIC-ASBLK-27032-27159 - United States Department of Defense (DoD) US1,594,112

AS637DNIC-ASBLK-00616-00665 - United States Department of Defense (DoD) US929,280

AS367DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD) US811,776

AS5852DNIC-ASBLK-05800-06055 - United States Department of Defense (DoD) US526,592

AS357DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD) US393,216

AS361DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD) US393,216

AS647DNIC-ASBLK-00616-00665 - United States Department of Defense (DoD) US348,928

AS27046DNIC-ASBLK-27032-27159 - United States Department of Defense (DoD) US311,552

AS5180DNIC-ASBLK-05120-05376 - United States Department of Defense (DoD) US270,848

AS1554DNIC-ASBLK-01550-01601 - United States Department of Defense (DoD) US266,496

AS5277DNIC-ASBLK-05120-05376 - United States Department of Defense (DoD) US265,472

AS370DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD) US264,192

AS6039DNIC-ASBLK-05800-06055 - United States Department of Defense (DoD) US224,000

AS1600DNIC-ASBLK-01550-01601 - United States Department of Defense (DoD) US197,120

AS331DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD) US196,608

AS335DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD) US196,608

AS340DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD) US196,352

AS5371DNIC-ASBLK-05120-05376 - United States Department of Defense (DoD) US196,352

AS6035DNIC-ASBLK-05800-06055 - United States Department of Defense (DoD) US167,936

AS27142DNIC-ASBLK-27032-27159 - United States Department of Defense (DoD) US155,904

AS6041DNIC-ASBLK-05800-06055 - United States Department of Defense (DoD) US147,200

AS665DNIC-ASBLK-00616-00665 - United States Department of Defense (DoD) US142,848

AS345DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD) US132,608

AS1556DNIC-ASBLK-01550-01601 - United States Department of Defense (DoD) US132,096

AS329DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD) US131,840

Similar-sized networks in United States

ASNNameIPv4 addresses

AS8075#4 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation80,749,056

AS7922#5 COMCAST-7922 - Comcast Cable Communications, LLC42,195,200

AS701#6 UUNET - Verizon Business40,608,768

AS3356#8 LEVEL3 - Level 3 Parent, LLC27,412,864

AS174#9 COGENT-174 - Cogent Communications, LLC24,663,935

AS396982#10 GOOGLE-CLOUD-PLATFORM - Google LLC22,019,072

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources