giving moderators the power to ban IPs?

[Gutspiller]

I am looking for this hack. Can somebody point me in the right direction? This hack would be very useful to my forum and my moderators as many people feel the need to destroy other peoples work, with spam and crap posts. I am not always around and I would like to give my moderators (only some moderators if possible) the ability to ban ips so people can't get back on.

If this hack doesn't exist, can somebody let me know what type of work would be involved and if somebody could create it?

I would greatly appreciate anybody that can help me with this much needed hack.

Thanks.