52.0.0.0-52.0.127.255 52.0.0.0/17
52.0.128.0-52.0.191.255 52.0.128.0/18
52.0.192.0-52.0.223.255 52.0.192.0/19
52.0.224.0-52.0.239.255 52.0.224.0/20
52.0.240.0-52.0.247.255 52.0.240.0/21
52.0.248.0-52.0.251.255 52.0.248.0/22