This plugin is outdated and might not be supported anymore
Spam IP Blocker

Spam IP Blocker

Details
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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

Details

Plugin code:
spam-ip-blocker
Plugin version:
0.9.2
Outdated:
Yes
WP version:
or higher
PHP version:
or higher
Test up to WP version:
3.1.4
Total installations:
100
Last updated:
2011-06-27
Rating:
Times rated:
1
blocking
comments
dnsbl
spam
spamhaus