51.0.0.0/8
568 announced IP ranges across this /8. Select a /16 block below for its own breakdown and assigned ranges.
| Block | Top country | Countries | ASNs | Ranges |
|---|---|---|---|---|
| 51.0.0.0/16 | Germany (80%) | 2 | 2 | 5 |
| 51.1.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.3.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.4.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.6.0.0/16 | United Kingdom (100%) | 1 | 1 | 1 |
| 51.8.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.9.0.0/16 | United Kingdom (100%) | 1 | 1 | 1 |
| 51.10.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.14.0.0/16 | United Kingdom (100%) | 1 | 1 | 1 |
| 51.15.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.16.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.19.0.0/16 | United States (100%) | 1 | 2 | 3 |
| 51.20.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.22.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.25.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.34.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.36.0.0/16 | Saudi Arabia (100%) | 1 | 1 | 3 |
| 51.37.0.0/16 | Ireland (100%) | 1 | 1 | 1 |
| 51.38.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.39.0.0/16 | Saudi Arabia (100%) | 1 | 1 | 8 |
| 51.40.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.41.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.44.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.46.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.51.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.52.0.0/16 | United Kingdom (100%) | 1 | 1 | 2 |
| 51.53.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.54.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.56.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.60.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.61.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.64.0.0/16 | United Kingdom (100%) | 1 | 4 | 5 |
| 51.68.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.69.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.72.0.0/16 | Germany (100%) | 1 | 1 | 1 |
| 51.74.0.0/16 | Germany (100%) | 1 | 1 | 2 |
| 51.75.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.76.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.77.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.78.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.79.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.80.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.81.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.82.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.83.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.84.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.86.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.89.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.90.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.91.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.92.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.97.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.102.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.103.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.108.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.109.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.110.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.111.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.112.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.115.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.117.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.119.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.120.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.121.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.124.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.125.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.126.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.127.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.131.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.132.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.133.0.0/16 | United Kingdom (100%) | 1 | 1 | 3 |
| 51.134.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.135.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.139.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.140.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.146.0.0/16 | United States (38%) | 15 | 38 | 111 |
| 51.148.0.0/16 | United Kingdom (100%) | 1 | 1 | 1 |
| 51.149.0.0/16 | United Kingdom (73%) | 2 | 6 | 11 |
| 51.150.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.154.0.0/16 | Switzerland (100%) | 1 | 1 | 1 |
| 51.155.0.0/16 | United Kingdom (100%) | 1 | 1 | 1 |
| 51.156.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.158.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.159.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.160.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.161.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.162.0.0/16 | Netherlands (67%) | 3 | 4 | 12 |
| 51.163.0.0/16 | Netherlands (57%) | 3 | 4 | 7 |
| 51.168.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.170.0.0/16 | United States (100%) | 1 | 2 | 10 |
| 51.171.0.0/16 | Ireland (100%) | 1 | 1 | 1 |
| 51.172.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.174.0.0/16 | Norway (100%) | 1 | 1 | 1 |
| 51.176.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.178.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.179.0.0/16 | United Kingdom (56%) | 3 | 5 | 9 |
| 51.180.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.182.0.0/16 | United Kingdom (100%) | 1 | 1 | 1 |
| 51.184.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.186.0.0/16 | United Kingdom (100%) | 1 | 1 | 1 |
| 51.188.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.190.0.0/16 | United Kingdom (100%) | 1 | 1 | 1 |
| 51.192.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.194.0.0/16 | United States (36%) | 12 | 48 | 119 |
| 51.195.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.196.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.198.0.0/16 | United States (50%) | 2 | 2 | 4 |
| 51.199.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.208.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.210.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.211.0.0/16 | Saudi Arabia (100%) | 1 | 2 | 4 |
| 51.212.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.218.0.0/16 | Saudi Arabia (100%) | 1 | 1 | 1 |
| 51.219.0.0/16 | United Kingdom (100%) | 1 | 1 | 1 |
| 51.220.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.222.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.223.0.0/16 | Saudi Arabia (100%) | 1 | 1 | 1 |
| 51.224.0.0/16 | Germany (100%) | 1 | 1 | 1 |
| 51.228.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.230.0.0/16 | United Kingdom (100%) | 1 | 1 | 2 |
| 51.232.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.235.0.0/16 | Saudi Arabia (100%) | 1 | 2 | 4 |
| 51.236.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.240.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.241.0.0/16 | United States (41%) | 15 | 49 | 128 |
| 51.244.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.248.0.0/16 | United States (100%) | 1 | 1 | 1 |
| 51.250.0.0/16 | Russia (100%) | 1 | 1 | 5 |
| 51.252.0.0/16 | Saudi Arabia (100%) | 1 | 1 | 1 |
| 51.254.0.0/16 | France (100%) | 1 | 1 | 1 |
| 51.255.0.0/16 | Vietnam (50%) | 2 | 2 | 2 |