online CIDR and IP subnet calculator : Check host

123.123.100.252-123.123.100.255
123.123.100.252/30

123.123.101.0-123.123.101.255
123.123.101.0/24

123.123.102.0-123.123.103.255
123.123.102.0/23

123.123.104.0-123.123.111.255
123.123.104.0/21

123.123.112.0-123.123.127.255
123.123.112.0/20

123.123.128.0-123.123.255.255
123.123.128.0/17

123.124.0.0-123.127.255.255
123.124.0.0/14

IP subnet calculator 123.123.100.252-123.127.255.255