COLT Technology Services Group Limited operates AS15404: 121 IPv4 prefixes covering 141,824 addresses, most of them in 
United Kingdom.
By IPv4 addresses the network ranks #1,377 worldwide and #30 of 1,931 networks in United Kingdom. That is 0.11% of the country’s IPv4 space.
The network spreads across six or more countries: United Kingdom 55%, Germany 26%, Italy 12%.
The largest block is 161.17.0.0 to 161.17.255.255 with 65,536 addresses, geolocated to Farnborough.
- IPv4 addresses
- 141,824
- IPv4 prefixes
- 121
- World rank
- #1,377
- Country share
- 0.11%
- IPv6 ranges
- 9
Addresses by country
- United Kingdom 55%
Germany 26%
Italy 12%
United States 3.3%
France 2.2%
Singapore 1.6%
Largest blocks
- 161.17.0.0 Farnborough65,536
- 194.59.96.0 Munich8,192
- 62.85.160.0 Rome8,192
- 148.188.192.0 New York4,096
- 148.188.0.0 Frankfurt am Main4,096
- 5.11.96.0 Parma4,096
- 193.26.246.0 Hamburg (Hamburg-Nord)2,560
- 194.99.120.0 Stuttgart (Bad Cannstatt)2,048
Networks of similar size
142,080
141,824
141,568IPv4 prefixes
- 5.11.96.0/20
- 45.129.69.0/24
- 46.28.212.0/24
- 51.64.34.0/23
- 62.85.160.0/19
- 62.182.250.0/24
- 77.74.158.0/23
- 85.208.193.0/24
- 91.209.87.0/24
- 91.212.245.0/24
- 91.213.65.0/24
- 91.213.68.0/24
- 91.213.91.0/24
- 91.213.110.0/24
- 91.238.4.0/24
- 91.244.125.0/24
- 109.107.145.0/24
- 129.35.17.0/24
- 129.35.20.0/23
- 129.35.85.0/24
- 139.138.235.0/24
- 141.98.45.0/24
- 148.188.0.0/20
- 148.188.192.0/20
- 148.188.224.0/22
- 148.188.232.0/21
- 155.137.0.0/22
- 155.137.7.0/24
- 156.118.0.0/24
- 156.118.6.0/24
- 156.118.8.0/24
- 157.239.128.0/23
- 158.156.155.0/24
- 158.156.162.0/24
- 158.156.172.0/24
- 158.156.182.0/24
- 158.156.193.0/24
- 161.17.0.0/16
- 163.199.254.0/24
- 170.200.251.0/24
- 170.200.252.0/23
- 170.248.142.0/24
- 170.251.108.0/24
- 170.252.84.0/23
- 170.252.86.0/24
- 176.119.201.0/24
- 178.249.200.0/21
- 185.13.62.0/24
- 185.60.76.0/23
- 185.60.79.0/24
- 185.134.140.0/24
- 185.140.104.0/24
- 185.154.148.0/23
- 185.199.204.0/24
- 185.203.232.0/24
- 185.212.156.0/22
- 185.213.216.0/23
- 185.218.120.0/22
- 185.226.224.0/24
- 185.234.136.0/24
- 188.64.17.0/24
- 188.64.18.0/23
- 192.31.22.0/24
- 192.76.161.0/24
- 192.109.222.0/24
- 192.166.107.0/24
- 192.228.1.0/24
- 192.228.2.0/23
- 192.232.64.0/24
- 192.232.66.0/24
- 193.8.64.0/22
- 193.26.246.0/23
- 193.26.248.0/21
- 193.28.71.0/24
- 193.29.146.0/23
- 193.29.150.0/23
- 193.29.152.0/22
- 193.29.156.0/23
- 193.29.159.0/24
- 193.38.200.0/24
- 193.46.62.0/24
- 193.47.140.0/24
- 193.53.174.0/24
- 193.53.185.0/24
- 193.53.186.0/24
- 193.53.188.0/24
- 193.53.190.0/24
- 193.56.33.0/24
- 193.57.56.0/24
- 193.58.6.0/24
- 193.73.113.0/24
- 193.102.79.0/24
- 193.102.174.0/24
- 193.103.129.0/24
- 193.135.254.0/24
- 193.164.14.0/24
- 193.176.112.0/22
- 193.177.180.0/23
- 193.200.191.0/24
- 194.11.129.0/24
- 194.15.16.0/24
- 194.15.18.0/24
- 194.15.242.0/23
- 194.15.244.0/22
- 194.33.183.0/24
- 194.39.220.0/24
- 194.59.96.0/19
- 194.59.137.0/24
- 194.59.139.0/24
- 194.76.8.0/23
- 194.99.12.0/24
- 194.99.120.0/21
- 194.117.239.0/24
- 194.126.242.0/24
- 194.173.47.0/24
- 195.47.207.0/24
- 195.182.60.0/24
- 195.234.175.0/24
- 202.246.252.0/24
- 202.252.108.0/23
- 213.163.237.0/24
Questions and answers
Who owns AS15404?
Autonomous system AS15404 is operated by COLT Technology Services Group Limited.
How many IP addresses does AS15404 have?
The network holds 141,824 IPv4 addresses in 121 prefixes, plus 9 IPv6 ranges.
Which country is AS15404 in?
The main country is United Kingdom, with addresses in 5 more countries.
How big is AS15404?
By IPv4 addresses it ranks #1,377 worldwide.
What is the largest address block of AS15404?
161.17.0.0 to 161.17.255.255, 65,536 addresses.