37.20.173.0-37.20.173.255 37.20.173.0/24
37.20.174.0-37.20.175.255 37.20.174.0/23
37.20.176.0-37.20.191.255 37.20.176.0/20
37.20.192.0-37.20.255.255 37.20.192.0/18