Ban certain IP ranges from registration

Would it be difficult to filter some IP ranges (typically known proxies) and not allow users from those ips to register or/and post? Well lets start with "to register" ...

Say, I know that some troublemakers are trying to register from proxy that belongs to range 67.159.0.0 to 67.159.127.255 and I do not want them to register at all.

Would it be complicated task?

This would be a very easy code for bb_plugins.php (preferably paste it before Captcha code):


Here, $cen variable is generated in index.php each time when forum action executes, so we could merely use it in the above code or similar process. Look up for /* Banned IPs/IDs stuff */

Thanks. I' ll definitely give it a try.