online CIDR and IP subnet calculator : Check host

123.57.3.0-123.57.3.255
123.57.3.0/24

123.57.4.0-123.57.7.255
123.57.4.0/22

123.57.8.0-123.57.15.255
123.57.8.0/21

123.57.16.0-123.57.31.255
123.57.16.0/20

123.57.32.0-123.57.63.255
123.57.32.0/19

123.57.64.0-123.57.127.255
123.57.64.0/18

123.57.128.0-123.57.135.255
123.57.128.0/21

123.57.136.0-123.57.139.255
123.57.136.0/22

123.57.140.0-123.57.141.255
123.57.140.0/23

IP subnet calculator 123.57.3.0-123.57.141.255