172.191.219.252-172.191.219.255 172.191.219.252/30
172.191.220.0-172.191.223.255 172.191.220.0/22
172.191.224.0-172.191.239.255 172.191.224.0/20
172.191.240.0-172.191.247.255 172.191.240.0/21