IP subnet calculator

123.56.108.0-123.56.125.255

123.56.108.0-123.56.111.255
123.56.108.0/22

123.56.112.0-123.56.119.255
123.56.112.0/21

123.56.120.0-123.56.123.255
123.56.120.0/22

123.56.124.0-123.56.125.255
123.56.124.0/23