online CIDR and IP subnet calculator : Check host

3.20.136.0-3.20.143.255
3.20.136.0/21

3.20.144.0-3.20.159.255
3.20.144.0/20

3.20.160.0-3.20.191.255
3.20.160.0/19

3.20.192.0-3.20.255.255
3.20.192.0/18

3.21.0.0-3.21.127.255
3.21.0.0/17

3.21.128.0-3.21.159.255
3.21.128.0/19

3.21.160.0-3.21.175.255
3.21.160.0/20

3.21.176.0-3.21.179.255
3.21.176.0/22

3.21.180.0-3.21.181.255
3.21.180.0/23

IP subnet calculator 3.20.136.0-3.21.181.255