IP subnet calculator

104.18.64.0-104.21.127.255

104.18.64.0-104.18.127.255
104.18.64.0/18

104.18.128.0-104.18.255.255
104.18.128.0/17

104.21.0.0-104.21.127.255
104.21.0.0/17

104.19.0.0-104.19.255.255
104.19.0.0/16

104.20.0.0-104.20.255.255
104.20.0.0/16