20.50.128.0-20.50.159.255 20.50.128.0/19
20.50.160.0-20.50.167.255 20.50.160.0/21
20.50.168.0-20.50.171.255 20.50.168.0/22
20.50.172.0-20.50.173.255 20.50.172.0/23