3.17.216.0-3.17.223.255 3.17.216.0/21
3.17.224.0-3.17.255.255 3.17.224.0/19
3.18.0.0-3.18.63.255 3.18.0.0/18
3.18.64.0-3.18.64.255 3.18.64.0/24