104.21.16.0-104.21.31.255 104.21.16.0/20
104.21.32.0-104.21.39.255 104.21.32.0/21
104.21.40.0-104.21.43.255 104.21.40.0/22
104.21.44.0-104.21.45.255 104.21.44.0/23