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AS1561 United States Department of Defense (DoD)

DNIC-ASBLK-01550-01601 - United States Department of Defense (DoD) · registered in the United States

IPv4 addresses65,53621 prefixes · 0.002% of announced IPv4
Rank in United States#1,073largest network in US by IPv4 space, of 18,338 · <0.01% of US
Rank worldwide#3,031of 79,396 networks with IPv4
IPv6noneno IPv6 routes announced
CountryUnited States18,679 ASNs registered there
Open AS1561 in ASN lookup Look up an IP in this network (6.126.0.1) All networks in United States

IPv4 prefixes

All 21 prefixes, in address order.

  • 6.126.0.0/23
  • 6.126.2.0/24
  • 6.126.3.0/24
  • 6.126.4.0/22
  • 6.126.8.0/21
  • 6.126.17.0/24
  • 6.126.18.0/23
  • 6.126.20.0/22
  • 6.126.24.0/21
  • 6.126.32.0/19
  • 6.126.64.0/20
  • 6.126.80.0/20
  • 6.126.96.0/19
  • 6.126.128.0/18
  • 6.126.192.0/19
  • 6.126.224.0/23
  • 6.126.226.0/23
  • 6.126.228.0/22
  • 6.126.232.0/21
  • 6.126.240.0/20
  • 206.39.39.0/24

Other ASNs named United States Department of Defense (DoD)

172 other networks use the same organisation name; together with AS1561 they announce 282,590,464 IPv4 addresses. Largest 30 shown.

ASNNameIPv4 addresses
AS749DNIC-AS-00749 - United States Department of Defense (DoD) US222,038,272
AS721DNIC-ASBLK-00721-00726 - United States Department of Defense (DoD) US29,541,376
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

Similar-sized networks in United States

ASNNameIPv4 addresses
AS353#1070 DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)65,536
AS371#1071 DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)65,536
AS1348#1072 CA-DOTNET-AS - California Department of Transportation65,536
AS1621#1074 ASN-SECURIAN - Securian Financial Group, Inc.65,536
AS1736#1075 MU-AS - Marquette University65,536
AS1932#1076 CONED - Consolidated Edison Co. of New York, Inc.65,536

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