It's in limewire.props. the line looks like this:

BLACK_LISTED_IP_ADDRESSES=

and then the list of IPs separated by semicolons, w/o space.

I assume we could just assemble the list of bad IPs semicolon-separated and then paste it into limewire.props

there was this site that had a constantly updated list of hostile ips but i can't quite remember where it was...

found something even better:

http://www.bluetack.co.uk