IP subnet calculator

3.78.12.0-3.78.65.255

3.78.12.0-3.78.15.255
3.78.12.0/22

3.78.16.0-3.78.31.255
3.78.16.0/20

3.78.32.0-3.78.63.255
3.78.32.0/19

3.78.64.0-3.78.65.255
3.78.64.0/23