ConfigServer Security & Firewall - blocking a range of !P addresses

[admin]

If you need to whitelist or block a range of IP addresses using CSF, it can be done, but you need to use the CIDR format.

For example, to block 192.168.0.0 to 192.168.0.255 you would add 192.168.0.0/24 to the blocked list.

This tool is helpful too:

http://ip2cidr.com