online CIDR and IP subnet calculator : Check host

15.206.138.0-15.206.139.255
15.206.138.0/23

15.206.140.0-15.206.143.255
15.206.140.0/22

15.206.144.0-15.206.159.255
15.206.144.0/20

15.206.160.0-15.206.191.255
15.206.160.0/19

15.206.192.0-15.206.255.255
15.206.192.0/18

15.207.0.0-15.207.7.255
15.207.0.0/21

15.207.8.0-15.207.11.255
15.207.8.0/22

15.207.12.0-15.207.12.255
15.207.12.0/24

IP subnet calculator 15.206.138.0-15.207.12.255