Blacklist subnet /32

[expat1001]

I'm trying to blacklist every IP on xxx.xxx.0.0, anything on the last 2 quatrants. When I select xxx.xxx.0.0 and add /32, it saves as a single IP, being xxx.xxx.0.0. What am I doing wrong? If nothing, how can I easily do this?
Thank you.

 

[Evolute IT]

You need to use /16 to block that whole subnet. /32 is one IP only.

/8 would be 192.x.x.x
/16 would be 192.168.x.x
/24 would be 192.168.1.x
/32 is 192.168.1.1

those are just examples

 

[expat1001]

Thanks very much.