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AS3300 BT British Telecommunications Limited

BT British Telecommunications Limited · registered in the United Kingdom

IPv4 addresses513,280103 prefixes · 0.016% of announced IPv4
Rank in United Kingdom#16largest network in GB by IPv4 space, of 2,074 · 0.76% of GB
Rank worldwide#573of 79,396 networks with IPv4
IPv61 x /32 (124,672 x /48)21 prefixes
CountryUnited Kingdom2,261 ASNs registered there
Open AS3300 in ASN lookup Look up an IP in this network (61.14.0.1) All networks in United Kingdom

IPv4 prefixes

All 103 prefixes, in address order.

  • 61.14.0.0/20
  • 61.14.16.0/20
  • 61.14.32.0/23
  • 61.14.34.0/24
  • 61.14.35.0/24
  • 61.14.36.0/24
  • 61.14.37.0/24
  • 61.14.38.0/23
  • 61.14.40.0/21
  • 61.14.48.0/22
  • 61.14.52.0/24
  • 61.14.53.0/24
  • 61.14.54.0/23
  • 61.14.56.0/21
  • 63.250.128.0/22
  • 63.250.132.0/24
  • 63.250.133.0/24
  • 63.250.134.0/23
  • 63.250.136.0/21
  • 63.250.144.0/24
  • 63.250.145.0/24
  • 63.250.146.0/23
  • 63.250.148.0/22
  • 63.250.152.0/21
  • 63.250.160.0/22
  • 63.250.164.0/23
  • 63.250.166.0/23
  • 63.250.168.0/21
  • 63.250.176.0/21
  • 63.250.184.0/22
  • 63.250.188.0/23
  • 63.250.190.0/23
  • 72.29.128.0/21
  • 72.29.136.0/21
  • 136.238.168.0/24
  • 136.238.185.0/24
  • 136.238.187.0/24
  • 136.238.229.0/24
  • 136.238.232.0/24
  • 136.238.238.0/23
  • 136.238.240.0/23
  • 136.238.243.0/24
  • 185.249.5.0/24
  • 185.249.6.0/24
  • 192.92.18.0/23
  • 192.92.20.0/22
  • 192.92.24.0/21
  • 192.92.32.0/19
  • 192.92.80.0/23
  • 192.92.82.0/24
  • 192.157.130.0/23
  • 192.157.132.0/22
  • 192.157.136.0/21
  • 192.157.144.0/20
  • 192.157.160.0/23
  • 192.237.64.0/18
  • 194.33.52.0/24
  • 195.206.69.0/24
  • 195.206.70.0/24
  • 198.137.75.0/24
  • 198.178.237.0/24
  • 198.178.239.0/24
  • 198.207.64.0/20
  • 198.207.80.0/22
  • 198.207.84.0/22
  • 198.207.88.0/21
  • 198.207.96.0/19
  • 199.6.64.0/18
  • 203.187.128.0/19
  • 204.52.187.0/24
  • 204.79.84.0/24
  • 204.140.64.0/18
  • 204.231.0.0/17
  • 204.231.128.0/18
  • 205.248.0.0/16
  • 206.182.0.0/17
  • 206.182.128.0/22
  • 206.182.132.0/23
  • 206.182.134.0/24
  • 206.182.135.0/24
  • 206.182.136.0/21
  • 206.182.144.0/20
  • 206.182.160.0/22
  • 206.182.164.0/24
  • 206.182.165.0/24
  • 206.182.166.0/23
  • 206.182.168.0/21
  • 206.182.176.0/20
  • 206.182.192.0/18
  • 207.117.0.0/16
  • 207.209.0.0/18
  • 207.209.64.0/19
  • 207.209.96.0/19
  • 207.209.128.0/17
  • 209.28.0.0/17
  • 209.28.128.0/19
  • 209.28.160.0/21
  • 209.28.168.0/22
  • 209.28.172.0/23
  • 209.28.174.0/24
  • 209.28.175.0/24
  • 209.28.176.0/20
  • 209.28.192.0/18

IPv6 prefixes

All 21 prefixes.

  • 2402:fb00::/34
  • 2402:fb00:4000::/34
  • 2402:fb00:8200::/39
  • 2402:fb00:8600::/39
  • 2402:fb00:8900::/40
  • 2402:fb00:8a00::/39
  • 2402:fb00:8c00::/38
  • 2402:fb00:9000::/36
  • 2402:fb00:a000::/35
  • 2402:fb00:c400::/38
  • 2402:fb00:c800::/37
  • 2402:fb00:d000::/36
  • 2402:fb00:e000::/35
  • 2606:f100::/33
  • 2606:f100:8000::/34
  • 2606:f100:c000::/36
  • 2606:f100:d200::/39
  • 2606:f100:e000::/38
  • 2606:f100:e600::/39
  • 2606:f100:e800::/37
  • 2606:f100:f000::/36

Other ASNs named BT British Telecommunications Limited

1 other network uses the same organisation name; together with AS3300 they announce 1,226,752 IPv4 addresses.

ASNNameIPv4 addresses
AS5400BT British Telecommunications Limited GB713,472

Similar-sized networks in United Kingdom

ASNNameIPv4 addresses
AS31655#13 ASN-GammaTelecom Gamma Telecom Holdings Ltd609,536
AS206067#14 H3GUK Hutchison 3G UK Limited529,152
AS13037#15 ZEN-AS Zen Internet Ltd527,616
AS42689#17 Glide Glide Student & Residential Limited499,200
AS8851#18 EDGE GCI Network Solutions Limited417,792
AS15395#19 RACKSPACE-LON Rackspace Ltd.402,176

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