17.253.128.0-17.253.191.255 17.253.128.0/18
17.253.192.0-17.253.199.255 17.253.192.0/21
17.253.200.0-17.253.203.255 17.253.200.0/22
17.253.204.0-17.253.205.255 17.253.204.0/23