online CIDR and IP subnet calculator : Check host

172.64.123.128-172.64.123.255
172.64.123.128/25

172.64.124.0-172.64.127.255
172.64.124.0/22

172.64.128.0-172.64.159.255
172.64.128.0/19

172.64.160.0-172.64.175.255
172.64.160.0/20

172.64.176.0-172.64.183.255
172.64.176.0/21

172.64.184.0-172.64.187.255
172.64.184.0/22

172.64.188.0-172.64.189.255
172.64.188.0/23

IP subnet calculator 172.64.123.128-172.64.189.255