online CIDR and IP subnet calculator : Check host

175.20.21.0-175.20.21.255
175.20.21.0/24

175.20.22.0-175.20.23.255
175.20.22.0/23

175.20.24.0-175.20.31.255
175.20.24.0/21

175.20.32.0-175.20.63.255
175.20.32.0/19

175.20.64.0-175.20.127.255
175.20.64.0/18

175.20.128.0-175.20.255.255
175.20.128.0/17

175.21.0.0-175.21.255.255
175.21.0.0/16

175.22.0.0-175.23.255.255
175.22.0.0/15

IP subnet calculator 175.20.21.0-175.23.255.255