IP subnet calculator

3.128.0.0-3.128.56.63

3.128.56.0-3.128.56.63
3.128.56.0/26

3.128.0.0-3.128.31.255
3.128.0.0/19

3.128.32.0-3.128.47.255
3.128.32.0/20

3.128.48.0-3.128.55.255
3.128.48.0/21