IP subnet calculator

123.31.7.0-123.31.47.255

123.31.7.0-123.31.7.255
123.31.7.0/24

123.31.8.0-123.31.15.255
123.31.8.0/21

123.31.16.0-123.31.31.255
123.31.16.0/20

123.31.32.0-123.31.47.255
123.31.32.0/20