3.18.160.0-3.18.191.255 3.18.160.0/19
3.18.192.0-3.18.255.255 3.18.192.0/18
3.20.0.0-3.20.127.255 3.20.0.0/17
3.20.128.0-3.20.129.255 3.20.128.0/23
3.19.0.0-3.19.255.255 3.19.0.0/16