fetus

🇬🇧イギリスUnited Kingdom


割り振り一覧

イギリスに割り振りされたIPアドレスの一覧です。

大体のケースでは「Merged CIDR」の表示の方が便利です。

データをアクセス制御に使いたい方は「ダウンロード」をご利用ください。

イギリスには133,400,968個のIPアドレスが割り振られています。これは全アドレス空間の3.10598%、予約領域を除くと3.60324%です。


201-400 of 8616 rows
CIDRIPアドレス割り振り日レジストリ
31.7.8.0/2131.7.8.0 - 31.7.15.2552011/04/12RIPE NCC
31.10.32.0/2031.10.32.0 - 31.10.47.2552011/04/14RIPE NCC
31.11.56.0/2131.11.56.0 - 31.11.63.2552011/04/14RIPE NCC
31.12.96.0/1931.12.96.0 - 31.12.127.2552011/04/18RIPE NCC
31.13.0.0/2131.13.0.0 - 31.13.7.2552011/04/18RIPE NCC
31.13.152.0/2131.13.152.0 - 31.13.159.2552011/04/19RIPE NCC
31.14.31.0/2431.14.31.0 - 31.14.31.2552011/04/18RIPE NCC
31.14.36.0/2231.14.36.0 - 31.14.39.2552011/04/18RIPE NCC
31.14.65.0/2431.14.65.0 - 31.14.65.2552011/04/18RIPE NCC
31.14.66.0/2331.14.66.0 - 31.14.67.2552011/04/18RIPE NCC
31.14.102.0/2431.14.102.0 - 31.14.102.2552011/04/18RIPE NCC
31.14.216.0/2331.14.216.0 - 31.14.217.2552011/04/18RIPE NCC
31.14.248.0/2231.14.248.0 - 31.14.251.2552011/04/18RIPE NCC
31.14.254.0/2431.14.254.0 - 31.14.254.2552011/04/18RIPE NCC
31.15.104.0/2131.15.104.0 - 31.15.111.2552011/04/20RIPE NCC
31.22.0.0/2131.22.0.0 - 31.22.7.2552011/03/25RIPE NCC
31.22.12.0/2231.22.12.0 - 31.22.15.2552019/02/25RIPE NCC
31.22.40.0/2131.22.40.0 - 31.22.47.2552011/03/25RIPE NCC
31.22.72.0/2131.22.72.0 - 31.22.79.2552011/08/03RIPE NCC
31.24.0.0/2131.24.0.0 - 31.24.7.2552011/02/21RIPE NCC
31.24.32.0/2131.24.32.0 - 31.24.39.2552011/02/22RIPE NCC
31.24.86.0/2431.24.86.0 - 31.24.86.2552022/01/11RIPE NCC
31.24.104.0/2331.24.104.0 - 31.24.105.2552011/02/23RIPE NCC
31.24.106.0/2431.24.106.0 - 31.24.106.2552011/02/23RIPE NCC
31.24.107.0/2431.24.107.0 - 31.24.107.2552011/02/23RIPE NCC
31.24.108.0/2331.24.108.0 - 31.24.109.2552011/02/23RIPE NCC
31.24.110.0/2431.24.110.0 - 31.24.110.2552011/02/23RIPE NCC
31.24.111.0/2431.24.111.0 - 31.24.111.2552011/02/23RIPE NCC
31.24.216.0/2131.24.216.0 - 31.24.223.2552011/02/28RIPE NCC
31.24.224.0/2131.24.224.0 - 31.24.231.2552011/02/28RIPE NCC
31.25.0.0/2131.25.0.0 - 31.25.7.2552011/03/02RIPE NCC
31.25.56.0/2131.25.56.0 - 31.25.63.2552011/03/03RIPE NCC
31.25.160.0/2131.25.160.0 - 31.25.167.2552011/03/08RIPE NCC
31.25.184.0/2131.25.184.0 - 31.25.191.2552011/03/08RIPE NCC
31.25.208.0/2131.25.208.0 - 31.25.215.2552011/03/09RIPE NCC
31.25.234.0/2331.25.234.0 - 31.25.235.2552011/03/09RIPE NCC
31.25.236.0/2231.25.236.0 - 31.25.239.2552011/03/09RIPE NCC
31.28.64.0/2431.28.64.0 - 31.28.64.2552011/02/23RIPE NCC
31.28.65.0/2431.28.65.0 - 31.28.65.2552011/02/23RIPE NCC
31.28.66.0/2431.28.66.0 - 31.28.66.2552011/02/23RIPE NCC
31.28.67.0/2431.28.67.0 - 31.28.67.2552011/02/23RIPE NCC
31.28.68.0/2431.28.68.0 - 31.28.68.2552011/02/23RIPE NCC
31.28.69.0/2431.28.69.0 - 31.28.69.2552011/02/23RIPE NCC
31.28.70.0/2431.28.70.0 - 31.28.70.2552011/02/23RIPE NCC
31.28.71.0/2431.28.71.0 - 31.28.71.2552011/02/23RIPE NCC
31.28.72.0/2431.28.72.0 - 31.28.72.2552011/02/23RIPE NCC
31.28.73.0/2431.28.73.0 - 31.28.73.2552011/02/23RIPE NCC
31.28.74.0/2431.28.74.0 - 31.28.74.2552011/02/23RIPE NCC
31.28.75.0/2431.28.75.0 - 31.28.75.2552011/02/23RIPE NCC
31.28.76.0/2331.28.76.0 - 31.28.77.2552011/02/23RIPE NCC
31.28.78.0/2431.28.78.0 - 31.28.78.2552011/02/23RIPE NCC
31.28.79.0/2431.28.79.0 - 31.28.79.2552011/02/23RIPE NCC
31.28.80.0/2231.28.80.0 - 31.28.83.2552011/02/23RIPE NCC
31.28.84.0/2331.28.84.0 - 31.28.85.2552011/02/23RIPE NCC
31.28.86.0/2431.28.86.0 - 31.28.86.2552011/02/23RIPE NCC
31.28.87.0/2431.28.87.0 - 31.28.87.2552011/02/23RIPE NCC
31.28.88.0/2131.28.88.0 - 31.28.95.2552011/02/23RIPE NCC
31.41.34.0/2431.41.34.0 - 31.41.34.2552022/06/24RIPE NCC
31.41.250.0/2431.41.250.0 - 31.41.250.2552021/08/16RIPE NCC
31.47.216.0/2131.47.216.0 - 31.47.223.2552011/03/22RIPE NCC
31.48.0.0/1331.48.0.0 - 31.55.255.2552010/12/31RIPE NCC
31.64.0.0/1131.64.0.0 - 31.95.255.2552010/11/25RIPE NCC
31.96.0.0/1131.96.0.0 - 31.127.255.2552010/11/25RIPE NCC
31.132.0.0/2131.132.0.0 - 31.132.7.2552011/06/15RIPE NCC
31.169.32.0/2131.169.32.0 - 31.169.39.2552011/03/28RIPE NCC
31.169.96.0/2131.169.96.0 - 31.169.103.2552011/03/29RIPE NCC
31.169.112.0/2131.169.112.0 - 31.169.119.2552011/03/29RIPE NCC
31.172.240.0/2031.172.240.0 - 31.172.255.2552011/04/05RIPE NCC
31.177.16.0/2131.177.16.0 - 31.177.23.2552011/03/11RIPE NCC
31.185.32.0/1931.185.32.0 - 31.185.63.2552011/03/15RIPE NCC
31.185.128.0/1731.185.128.0 - 31.185.255.2552011/03/15RIPE NCC
31.186.224.0/2231.186.224.0 - 31.186.227.2552011/03/24RIPE NCC
31.186.228.0/2331.186.228.0 - 31.186.229.2552011/03/24RIPE NCC
31.186.230.0/2331.186.230.0 - 31.186.231.2552011/03/24RIPE NCC
31.186.232.0/2131.186.232.0 - 31.186.239.2552011/03/24RIPE NCC
31.186.240.0/2031.186.240.0 - 31.186.255.2552011/03/24RIPE NCC
31.192.96.0/2131.192.96.0 - 31.192.103.2552011/08/05RIPE NCC
31.192.240.0/2131.192.240.0 - 31.192.247.2552011/04/21RIPE NCC
31.193.0.0/2031.193.0.0 - 31.193.15.2552011/04/21RIPE NCC
31.193.128.0/2031.193.128.0 - 31.193.143.2552011/04/27RIPE NCC
31.193.168.0/2131.193.168.0 - 31.193.175.2552011/04/27RIPE NCC
31.205.0.0/1631.205.0.0 - 31.205.255.2552011/04/29RIPE NCC
31.207.40.0/2231.207.40.0 - 31.207.43.2552011/05/02RIPE NCC
31.210.24.0/2131.210.24.0 - 31.210.31.2552011/05/04RIPE NCC
31.210.128.0/2131.210.128.0 - 31.210.135.2552011/05/04RIPE NCC
31.210.232.0/2131.210.232.0 - 31.210.239.2552011/05/05RIPE NCC
31.210.240.0/2131.210.240.0 - 31.210.247.2552011/05/06RIPE NCC
31.211.160.0/2131.211.160.0 - 31.211.167.2552011/05/06RIPE NCC
31.216.0.0/2031.216.0.0 - 31.216.15.2552011/05/09RIPE NCC
31.216.48.0/2131.216.48.0 - 31.216.55.2552011/05/09RIPE NCC
31.220.192.0/1831.220.192.0 - 31.220.255.2552011/05/12RIPE NCC
31.221.0.0/1731.221.0.0 - 31.221.127.2552011/05/11RIPE NCC
31.222.128.0/1831.222.128.0 - 31.222.191.2552011/05/13RIPE NCC
31.222.200.0/2131.222.200.0 - 31.222.207.2552011/05/16RIPE NCC
31.222.216.0/2231.222.216.0 - 31.222.219.2552011/08/24RIPE NCC
31.222.220.0/2231.222.220.0 - 31.222.223.2552011/08/24RIPE NCC
37.0.96.0/2137.0.96.0 - 37.0.103.2552011/12/09RIPE NCC
37.1.88.0/2137.1.88.0 - 37.1.95.2552011/12/09RIPE NCC
37.1.96.0/2137.1.96.0 - 37.1.103.2552011/12/12RIPE NCC
37.1.152.0/2137.1.152.0 - 37.1.159.2552011/12/13RIPE NCC
37.1.192.0/1937.1.192.0 - 37.1.223.2552011/12/13RIPE NCC
37.1.224.0/2137.1.224.0 - 37.1.231.2552011/12/13RIPE NCC
37.9.56.0/2137.9.56.0 - 37.9.63.2552011/12/14RIPE NCC
37.10.113.0/2437.10.113.0 - 37.10.113.2552011/12/15RIPE NCC
37.10.114.0/2437.10.114.0 - 37.10.114.2552011/12/15RIPE NCC
37.17.184.0/2137.17.184.0 - 37.17.191.2552011/12/19RIPE NCC
37.18.128.0/2237.18.128.0 - 37.18.131.2552018/06/13RIPE NCC
37.19.192.0/1937.19.192.0 - 37.19.223.2552011/12/21RIPE NCC
37.25.44.0/2237.25.44.0 - 37.25.47.2552011/12/23RIPE NCC
37.26.74.0/2337.26.74.0 - 37.26.75.2552011/12/27RIPE NCC
37.26.76.0/2237.26.76.0 - 37.26.79.2552011/12/27RIPE NCC
37.26.104.0/2137.26.104.0 - 37.26.111.2552011/12/27RIPE NCC
37.32.100.0/2437.32.100.0 - 37.32.100.2552020/01/06RIPE NCC
37.32.102.0/2437.32.102.0 - 37.32.102.2552020/01/06RIPE NCC
37.35.72.0/2137.35.72.0 - 37.35.79.2552012/01/05RIPE NCC
37.35.88.0/2137.35.88.0 - 37.35.95.2552012/01/06RIPE NCC
37.44.228.0/2237.44.228.0 - 37.44.231.2552018/11/12RIPE NCC
37.46.0.0/2137.46.0.0 - 37.46.7.2552012/01/11RIPE NCC
37.46.24.0/2137.46.24.0 - 37.46.31.2552012/01/11RIPE NCC
37.46.200.0/2137.46.200.0 - 37.46.207.2552012/01/13RIPE NCC
37.48.224.0/2437.48.224.0 - 37.48.224.2552012/01/25RIPE NCC
37.48.225.0/2437.48.225.0 - 37.48.225.2552012/01/25RIPE NCC
37.48.226.0/2337.48.226.0 - 37.48.227.2552012/01/25RIPE NCC
37.48.228.0/2437.48.228.0 - 37.48.228.2552012/01/25RIPE NCC
37.48.229.0/2437.48.229.0 - 37.48.229.2552012/01/25RIPE NCC
37.48.230.0/2437.48.230.0 - 37.48.230.2552012/01/25RIPE NCC
37.48.231.0/2437.48.231.0 - 37.48.231.2552012/01/25RIPE NCC
37.48.240.0/2137.48.240.0 - 37.48.247.2552012/01/25RIPE NCC
37.58.24.0/2137.58.24.0 - 37.58.31.2552012/01/16RIPE NCC
37.60.64.0/1837.60.64.0 - 37.60.127.2552012/01/17RIPE NCC
37.61.232.0/2137.61.232.0 - 37.61.239.2552012/01/24RIPE NCC
37.72.112.0/2137.72.112.0 - 37.72.119.2552012/01/26RIPE NCC
37.72.132.0/2437.72.132.0 - 37.72.132.2552021/09/20RIPE NCC
37.72.152.0/2137.72.152.0 - 37.72.159.2552012/01/27RIPE NCC
37.75.232.0/2137.75.232.0 - 37.75.239.2552012/01/31RIPE NCC
37.77.176.0/2137.77.176.0 - 37.77.183.2552012/02/03RIPE NCC
37.77.192.0/2137.77.192.0 - 37.77.199.2552012/02/03RIPE NCC
37.98.144.0/2137.98.144.0 - 37.98.151.2552012/02/06RIPE NCC
37.110.248.0/2137.110.248.0 - 37.110.255.2552012/02/09RIPE NCC
37.122.192.0/2137.122.192.0 - 37.122.199.2552012/02/14RIPE NCC
37.122.248.0/2137.122.248.0 - 37.122.255.2552012/02/15RIPE NCC
37.123.112.0/2137.123.112.0 - 37.123.119.2552012/02/15RIPE NCC
37.123.248.0/2137.123.248.0 - 37.123.255.2552012/02/16RIPE NCC
37.128.128.0/2137.128.128.0 - 37.128.135.2552012/02/16RIPE NCC
37.128.184.0/2137.128.184.0 - 37.128.191.2552012/02/20RIPE NCC
37.130.232.0/2237.130.232.0 - 37.130.235.2552012/02/23RIPE NCC
37.130.236.0/2237.130.236.0 - 37.130.239.2552012/02/23RIPE NCC
37.130.248.0/2137.130.248.0 - 37.130.255.2552012/02/23RIPE NCC
37.143.136.0/2137.143.136.0 - 37.143.143.2552012/03/02RIPE NCC
37.148.216.0/2137.148.216.0 - 37.148.223.2552012/03/07RIPE NCC
37.152.32.0/2037.152.32.0 - 37.152.47.2552012/03/09RIPE NCC
37.152.48.0/2137.152.48.0 - 37.152.55.2552012/03/09RIPE NCC
37.152.192.0/1837.152.192.0 - 37.152.255.2552012/03/12RIPE NCC
37.153.72.0/2137.153.72.0 - 37.153.79.2552012/03/13RIPE NCC
37.156.64.0/2437.156.64.0 - 37.156.64.2552012/03/13RIPE NCC
37.156.65.0/2437.156.65.0 - 37.156.65.2552012/03/13RIPE NCC
37.156.72.0/2237.156.72.0 - 37.156.75.2552012/03/13RIPE NCC
37.156.173.0/2437.156.173.0 - 37.156.173.2552012/03/13RIPE NCC
37.157.32.0/2137.157.32.0 - 37.157.39.2552012/03/14RIPE NCC
37.157.48.0/2137.157.48.0 - 37.157.55.2552012/03/14RIPE NCC
37.157.240.0/2137.157.240.0 - 37.157.247.2552012/03/16RIPE NCC
37.188.96.0/1937.188.96.0 - 37.188.127.2552012/03/20RIPE NCC
37.191.96.0/1937.191.96.0 - 37.191.127.2552012/03/22RIPE NCC
37.200.112.0/2137.200.112.0 - 37.200.119.2552012/03/22RIPE NCC
37.203.40.0/2137.203.40.0 - 37.203.47.2552012/03/23RIPE NCC
37.203.128.0/1837.203.128.0 - 37.203.191.2552012/03/26RIPE NCC
37.205.56.0/2137.205.56.0 - 37.205.63.2552012/03/28RIPE NCC
37.208.80.0/2137.208.80.0 - 37.208.87.2552012/03/29RIPE NCC
37.209.208.0/2037.209.208.0 - 37.209.223.2552012/03/30RIPE NCC
37.220.0.0/1937.220.0.0 - 37.220.31.2552012/04/03RIPE NCC
37.220.88.0/2137.220.88.0 - 37.220.95.2552012/04/03RIPE NCC
37.220.96.0/2137.220.96.0 - 37.220.103.2552012/04/03RIPE NCC
37.220.104.0/2137.220.104.0 - 37.220.111.2552012/04/03RIPE NCC
37.221.216.0/2137.221.216.0 - 37.221.223.2552012/04/10RIPE NCC
37.230.48.0/2037.230.48.0 - 37.230.63.2552012/04/11RIPE NCC
37.230.138.0/2437.230.138.0 - 37.230.138.2552012/04/11RIPE NCC
37.235.40.0/2137.235.40.0 - 37.235.47.2552012/04/16RIPE NCC
37.235.120.0/2137.235.120.0 - 37.235.127.2552012/04/18RIPE NCC
37.244.64.0/1837.244.64.0 - 37.244.127.2552012/04/16RIPE NCC
37.252.0.0/2037.252.0.0 - 37.252.15.2552012/04/18RIPE NCC
37.252.24.0/2137.252.24.0 - 37.252.31.2552012/04/19RIPE NCC
37.252.32.0/1937.252.32.0 - 37.252.63.2552012/04/18RIPE NCC
37.252.192.0/2137.252.192.0 - 37.252.199.2552012/04/20RIPE NCC
40.17.0.0/1640.17.0.0 - 40.17.255.2551991/04/23RIPE NCC
40.21.0.0/1640.21.0.0 - 40.21.255.2551991/04/23RIPE NCC
40.25.0.0/1640.25.0.0 - 40.25.255.2551991/04/23RIPE NCC
40.33.0.0/1640.33.0.0 - 40.33.255.2551991/04/23RIPE NCC
40.34.0.0/1640.34.0.0 - 40.34.255.2551991/04/23RIPE NCC
40.169.0.0/1640.169.0.0 - 40.169.255.2551991/04/23RIPE NCC
40.170.0.0/1640.170.0.0 - 40.170.255.2551991/04/23RIPE NCC
40.171.0.0/1640.171.0.0 - 40.171.255.2551991/04/23RIPE NCC
40.218.0.0/1640.218.0.0 - 40.218.255.2551991/04/23RIPE NCC
40.249.0.0/1640.249.0.0 - 40.249.255.2551991/04/23RIPE NCC
43.239.88.0/2243.239.88.0 - 43.239.91.2552015/08/11RIPE NCC
45.8.100.0/2245.8.100.0 - 45.8.103.2552019/04/12RIPE NCC
45.8.120.0/2245.8.120.0 - 45.8.123.2552019/04/15RIPE NCC
45.8.180.0/2245.8.180.0 - 45.8.183.2552019/04/16RIPE NCC
45.8.224.0/2245.8.224.0 - 45.8.227.2552019/04/16RIPE NCC
45.9.22.0/2445.9.22.0 - 45.9.22.2552021/05/03RIPE NCC
45.9.23.0/2445.9.23.0 - 45.9.23.2552021/05/03RIPE NCC
Merged CIDR

連続した割り振りブロックを統合したリストです。

1-200 of 7580 rows
CIDR
1.186.0.0/16
2.24.0.0/13
2.56.84.0/22
2.56.188.0/22
2.56.196.0/22
2.57.44.0/22
2.57.196.0/22
2.57.200.0/22
2.57.237.0/24
2.58.4.0/22
2.58.152.0/22
2.58.160.0/22
2.58.192.0/22
2.59.24.0/22
2.59.200.0/22
2.96.0.0/13
2.120.0.0/13
2.216.0.0/13
5.1.45.0/24
5.2.16.0/21
5.2.96.0/19
5.10.16.0/20
5.10.136.0/21
5.10.144.0/20
5.11.8.0/21
5.11.16.0/20
5.11.88.0/21
5.22.136.0/21
5.22.224.0/21
5.28.48.0/20
5.32.152.0/21
5.39.176.0/21
5.39.248.0/21
5.44.16.0/20
5.44.224.0/20
5.45.16.0/20
5.45.48.0/21
5.45.64.0/19
5.53.64.0/19
5.56.48.0/21
5.56.168.0/21
5.57.56.0/21
5.57.80.0/20
5.61.32.0/19
5.61.72.0/21
5.61.120.0/21
5.62.0.0/18
5.63.18.0/24
5.64.0.0/13
5.77.32.0/19
5.79.0.0/18
5.80.0.0/15
5.83.8.0/21
5.83.96.0/21
5.83.192.0/19
5.100.168.0/21
5.101.136.0/21
5.101.144.0/21
5.101.168.0/21
5.102.80.0/20
5.102.168.0/21
5.102.184.0/21
5.133.16.0/21
5.133.40.0/21
5.133.72.0/22
5.133.80.0/22
5.133.88.0/22
5.133.168.0/21
5.133.176.0/20
5.133.240.0/21
5.134.8.0/21
5.144.80.0/20
5.144.152.0/21
5.144.176.0/21
5.145.178.0/23
5.148.0.0/17
5.148.128.0/19
5.149.8.0/21
5.150.0.0/17
5.150.160.0/19
5.151.0.0/16
5.152.192.0/19
5.153.64.0/19
5.153.96.0/21
5.153.192.0/19
5.153.224.0/21
5.153.248.0/21
5.154.128.0/19
5.154.182.0/23
5.154.184.0/24
5.154.188.0/23
5.154.232.0/24
5.154.242.0/24
5.157.64.0/21
5.158.88.0/21
5.158.208.0/21
5.158.224.0/21
5.159.120.0/21
5.159.196.0/22
5.159.200.0/21
5.159.208.0/21
5.159.224.0/21
5.172.48.0/20
5.172.152.0/21
5.172.160.0/20
5.172.183.0/24
5.175.56.0/21
5.178.96.0/20
5.179.72.0/21
5.179.96.0/20
5.180.96.0/22
5.180.188.0/22
5.180.208.0/21
5.181.4.0/22
5.181.20.0/22
5.181.52.0/24
5.181.56.0/22
5.181.72.0/22
5.181.104.0/22
5.181.136.0/22
5.182.8.0/22
5.182.76.0/22
5.182.220.0/22
5.183.44.0/22
5.183.60.0/22
5.183.112.0/22
5.183.176.0/22
5.187.16.0/20
5.198.0.0/17
5.198.136.0/21
5.199.0.0/17
5.226.56.0/21
5.226.136.0/21
5.226.176.0/21
5.252.36.0/22
5.252.156.0/22
5.252.208.0/22
5.252.220.0/22
5.253.104.0/21
5.253.112.0/22
5.253.168.0/22
5.253.224.0/24
5.253.252.0/22
5.254.0.0/17
5.254.160.0/21
5.255.48.0/21
5.255.58.0/23
5.255.60.0/24
5.255.136.0/21
9.135.0.0/16
9.141.0.0/16
9.145.0.0/16
9.146.0.0/16
9.149.0.0/16
9.160.0.0/16
9.163.0.0/16
9.164.0.0/16
9.166.0.0/15
9.169.0.0/16
9.177.0.0/16
9.185.0.0/16
9.205.0.0/16
9.220.0.0/16
9.223.0.0/16
9.228.0.0/15
9.231.0.0/16
9.234.0.0/15
9.248.0.0/16
13.117.0.0/16
13.118.0.0/15
13.123.0.0/16
13.240.0.0/16
23.19.56.0/21
23.90.64.0/22
23.106.32.0/21
23.106.56.0/21
23.106.232.0/21
23.146.248.0/24
25.0.0.0/8
27.121.104.0/22
31.3.64.0/21
31.3.208.0/20
31.3.224.0/19
31.6.72.0/21
31.7.8.0/21
31.10.32.0/20
31.11.56.0/21
31.12.96.0/19
31.13.0.0/21
31.13.152.0/21
31.14.31.0/24
31.14.36.0/22
31.14.65.0/24
31.14.66.0/23
31.14.102.0/24
31.14.216.0/23
31.14.248.0/22
31.14.254.0/24
31.15.104.0/21
31.22.0.0/21