AS1540 Headquarters, USAISC

DNIC-ASBLK-01534-01546 - Headquarters, USAISC · registered in the United States

IPv4 addresses7,430,1441,228 prefixes · 0.237% of announced IPv4

Rank in United States#23largest network in US by IPv4 space, of 18,338 · 0.55% of US

Rank worldwide#60of 79,396 networks with IPv4

IPv663 x /4863 prefixes

CountryUnited States18,679 ASNs registered there

Open AS1540 in ASN lookup Look up an IP in this network (6.16.48.1) All networks in United States

IPv4 prefixes

First 500 of 1,228 prefixes, in address order.

6.16.48.0/24
6.16.51.0/24
6.16.52.0/24
6.16.66.0/23
6.16.68.0/22
6.16.72.0/23
6.16.76.0/22
6.16.80.0/23
6.16.90.0/23
6.16.92.0/22
6.16.96.0/23
6.16.100.0/22
6.16.104.0/22
6.16.112.0/23
6.16.115.0/24
6.17.80.0/24
6.17.88.0/21
6.41.0.0/16
6.42.56.0/22
6.42.60.0/23
6.42.64.0/18
6.42.128.0/19
6.42.160.0/20
6.42.176.0/21
6.42.184.0/22
6.42.188.0/23
6.42.192.0/19
6.42.224.0/21
6.42.232.0/22
6.42.243.0/24
6.42.244.0/22
6.44.0.0/17
6.44.128.0/18
6.44.197.0/24
6.45.32.0/20
6.48.64.0/20
6.50.40.0/24
6.64.128.0/23
6.64.138.0/23
6.64.146.0/24
6.64.151.0/24
6.64.152.0/24
6.64.157.0/24
6.64.159.0/24
6.64.162.0/23
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6.65.4.0/24
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6.65.40.0/24
6.65.44.0/22
6.65.48.0/22
6.65.58.0/23
6.65.130.0/23
6.65.132.0/22
6.65.136.0/21
6.65.144.0/20
6.65.160.0/20
6.65.176.0/21
6.65.184.0/22
6.66.2.0/23
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6.66.16.0/22
6.66.20.0/24
6.66.22.0/23
6.66.24.0/21
6.66.32.0/21
6.66.40.0/22
6.66.56.0/21
6.66.66.0/23
6.66.68.0/22
6.66.72.0/21
6.66.80.0/20
6.66.96.0/19
6.66.128.0/20
6.66.144.0/21
6.66.152.0/22
6.66.157.0/24
6.66.158.0/24
6.66.224.0/22
6.66.228.0/24
6.66.230.0/23
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6.66.238.0/23
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6.68.0.0/16
6.69.6.0/23
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6.69.16.0/20
6.69.32.0/20
6.69.48.0/21
6.69.56.0/22
6.69.60.0/23
6.69.64.0/18
6.69.128.0/21
6.69.136.0/22
6.70.1.0/24
6.70.2.0/23
6.70.9.0/24
6.70.10.0/23
6.70.12.0/22
6.70.16.0/21
6.70.24.0/22
6.70.28.0/23
6.70.32.0/20
6.70.48.0/21
6.70.66.0/23
6.70.68.0/22
6.70.72.0/21
6.70.80.0/20
6.70.96.0/19
6.70.130.0/23
6.70.132.0/22
6.70.136.0/21
6.70.144.0/20
6.70.160.0/19
6.71.148.0/22
6.71.184.0/21
6.71.192.0/19
6.71.224.0/21
6.72.0.0/20
6.72.20.0/22
6.72.192.0/22
6.72.200.0/21
6.72.208.0/21
6.72.216.0/22
6.72.224.0/21
6.72.232.0/22
6.72.240.0/21
6.72.248.0/22
6.72.254.0/23
6.73.193.0/24
6.73.194.0/23
6.73.196.0/24
6.73.209.0/24
6.73.220.0/23
6.73.222.0/24
6.73.224.0/20
6.73.240.0/21
6.73.248.0/22
6.73.252.0/23
6.74.4.0/23
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6.74.12.0/22
6.74.16.0/23
6.74.46.0/23
6.74.48.0/21
6.75.91.0/24
6.76.70.0/23
6.77.0.0/21
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6.77.28.0/23
6.77.34.0/23
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6.77.40.0/23
6.77.44.0/22
6.77.48.0/22
6.77.54.0/23
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6.79.32.0/21
6.80.16.0/20
6.80.64.0/19
6.80.132.0/24
6.80.134.0/24
6.80.174.0/23
6.80.208.0/24
6.124.128.0/24
6.126.16.0/24
6.129.32.0/19
6.129.64.0/19
6.130.14.0/24
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6.133.68.0/23
6.140.0.0/15
6.148.32.0/22
6.148.48.0/23
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6.148.113.0/24
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6.240.0.0/15
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6.243.128.0/18
6.243.192.0/19
6.243.224.0/21
6.243.232.0/23
6.243.235.0/24
6.243.236.0/22
6.243.240.0/20
6.244.0.0/14
6.248.0.0/13
55.179.144.0/23
55.179.230.0/23
55.179.232.0/22
55.179.236.0/24
55.196.0.0/23
55.196.2.0/23
55.196.4.0/22
55.196.8.0/21
55.196.16.0/20
55.196.32.0/19
55.196.64.0/18
55.196.128.0/17
55.201.242.0/24
55.209.100.0/24
55.209.202.0/24
128.190.0.0/23
128.190.2.0/24
128.190.3.0/24
128.190.4.0/22
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128.190.32.0/19
128.190.64.0/18
128.190.128.0/17
129.29.0.0/16
129.139.0.0/16
130.114.0.0/16
132.140.0.0/24
132.140.2.0/23
132.140.4.0/22
132.159.0.0/16
134.78.0.0/16
134.80.24.0/22
134.80.208.0/21
134.233.8.0/23
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134.233.64.0/18
134.233.128.0/18
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134.234.0.0/17
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136.205.0.0/17
136.205.128.0/19
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136.205.192.0/18
136.217.5.0/24
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136.217.240.0/21
136.217.248.0/22
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138.27.0.0/16
138.50.0.0/21
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139.139.0.0/19
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139.139.128.0/24
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140.16.138.0/24
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140.155.166.0/24
140.155.192.0/23
140.155.194.0/24
140.155.207.0/24
140.155.214.0/24
140.155.224.0/23
140.183.0.0/16
140.187.0.0/17
140.187.128.0/18
140.187.192.0/21
140.187.200.0/24
140.187.201.0/24
140.187.202.0/23
140.187.204.0/22
140.187.208.0/20
140.187.224.0/19
140.196.0.0/16
140.202.0.0/16
141.107.0.0/19
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141.107.40.0/24
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141.107.48.0/20
141.107.64.0/18
141.107.128.0/17
143.68.192.0/20
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143.69.64.0/20
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143.70.199.0/24
143.71.0.0/16
143.72.0.0/16
143.73.0.0/22
143.73.30.0/23
143.73.37.0/24
143.73.126.0/24
143.74.250.0/24

IPv6 prefixes

All 63 prefixes.

2608:100:3130::/48
2608:101:190::/48
2608:103:4f0::/48
2608:103:2740::/48
2608:104:500::/48
2608:104:2a20::/48
2608:109:15b0::/48
2608:122:3ff0::/48
2608:123:4220::/48
2608:124:b70::/48
2608:124:4d10::/48
2608:125:e80::/48
2608:125:4ee0::/48
2608:127:17f0::/48
2608:127:5ba0::/48
2608:128:5bc0::/48
2608:129:2a10::/48
2608:129:5bd0::/48
2608:140:2080::/48
2608:140:4190::/48
2608:141:48a0::/48
2608:142:d90::/48
2608:142:24a0::/48
2608:143:29b0::/48
2608:143:5450::/48
2608:144:2f30::/48
2608:146:3f10::/48
2608:147:3f30::/48
2608:147:61d0::/48
2608:148:1b50::/48
2608:148:3f60::/48
2608:148:61e0::/48
2608:149:1b80::/48
2608:149:3f80::/48
2608:160:2280::/48
2608:161:20::/48
2608:162:1660::/48
2608:164:c0::/48
2608:164:1ba0::/48
2608:165:2b0::/48
2608:165:1bc0::/48
2608:167:1be0::/48
2608:169:9c0::/48
2608:180:90::/48
2608:181:ea0::/48
2608:181:18f0::/48
2608:182:42a0::/48
2608:183:4a30::/48
2608:186:2680::/48
2608:189:18d0::/48
2608:4120:c0::/48
2608:4120:660::/48
2608:4121:370::/48
2608:4121:580::/48
2608:4124:300::/48
2608:4126:70::/48
2608:4126:5d0::/48
2608:4127:290::/48
2608:4129:b0::/48
2608:4129:170::/48
2608:4129:640::/48
2608:4162:30::/48
2608:4181:20::/48

Other ASNs named Headquarters, USAISC

26 other networks use the same organisation name; together with AS1540 they announce 9,863,936 IPv4 addresses.

ASNNameIPv4 addresses

AS4010DNIC-AS-04010 - Headquarters, USAISC US1,175,808

AS1637DNIC-AS-01637 - Headquarters, USAISC US201,728

AS1602DNIC-AS-01602 - Headquarters, USAISC US199,936

AS1649DNIC-AS-01649 - Headquarters, USAISC US131,584

AS1530DNIC-ASBLK-01529-01530 - Headquarters, USAISC US131,072

AS1493DNIC-ASBLK-01492-01493 - Headquarters, USAISC US119,808

AS289DNIC-AS-00289 - Headquarters, USAISC US88,320

AS1516DNIC-ASBLK-01513-01518 - Headquarters, USAISC US86,016

AS13DNIC-AS-00013 - Headquarters, USAISC US79,104

AS252DNIC-AS-00252 - Headquarters, USAISC US69,120

AS747DNIC-AS-00747 - Headquarters, USAISC US68,864

AS1501DNIC-ASBLK-01500-01502 - Headquarters, USAISC US41,984

AS213DNIC-AS-00213 - Headquarters, USAISC US32,768

AS588DIRECTRON - Headquarters, USAISC US4,096

AS153CTNOSC-ASN-153 - Headquarters, USAISC US512

AS258BRAGGSRI-EGP-AS - Headquarters, USAISC US512

AS538DNIC-AS-00538 - Headquarters, USAISC US512

AS1544DNIC-ASBLK-01534-01546 - Headquarters, USAISC US512

AS1508DNIC-AS-01508 - Headquarters, USAISC US256

AS670DNIC-AS-00670 - Headquarters, USAISC US256

AS672DNIC-AS-00672 - Headquarters, USAISC US256

AS673DNIC-AS-00673 - Headquarters, USAISC US256

AS1492DNIC-ASBLK-01492-01493 - Headquarters, USAISC US256

AS1523DNIC-ASBLK-01522-01526 - Headquarters, USAISC US256

AS575DNIC-AS-00575 - Headquarters, USAISC USIPv6 only

AS1542DNIC-ASBLK-01534-01546 - Headquarters, USAISC USIPv6 only

Similar-sized networks in United States

ASNNameIPv4 addresses

AS5650#20 FRONTIER-FRTR - Frontier Communications of America, Inc.10,665,984

AS7029#21 WINDSTREAM - Windstream Communications LLC10,421,504

AS56#22 DNIC-AS-00056 - United States Department of Defense (DoD)7,785,728

AS10796#24 TWC-10796-MIDWEST - Charter Communications Inc7,405,568

AS20001#25 TWC-20001-PACWEST - Charter Communications Inc7,210,752

AS2828#26 XO-AS15 - Verizon Business6,535,680

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