We'll create fresh WordPress site with Spam IP Blocker installed. You have 20 minutes to test the plugin after that site we'll be deleted.
This is a spam IP blocker. It is free. It marks any new comment as spam automatically when commenter’s IP exists in at least one of ‘.zen.spamhaus.org’ & ‘.bl.spamcop.net’.
Plugin is based on public DNSBL class.
Official page of DNSBL class on PHPClasses.org