Martin Lormes

<p><em>Block Top Spammers</em> displays a list of your top spammers’ IP addresses, based on all comments in your database that are marked as spam. It also generates a blacklist for your <code>.htaccess</code> file to block those spammers from your website entirely, thus taking load off the server. – You will need another plugin (like <a href="http://akismet.com/" rel="nofollow ugc">Akismet</a>) to identify the spam.</p>
<p>PHP 5 and Apache required.</p>
<h3>Roadmap</h3>
<h4>0.6 (April 2010)</h4>
<ul>
<li>edit blacklist (i.e. remove individual addresses, manually add addresses and/or subnets)</li>
<li>manually override .htaccess location</li>
<li>customize 403 error shown to blocked spammers</li>
</ul>
<h4>1.0 (May 2010)</h4>
<ul>
<li>Multi-Site support (WordPress 3.0, maybe WPMU 2.8/2.9)</li>
</ul>


Block Top Spammers

Block Top Spammers displays a list of your top spammers' IP addresses. It also generates a blacklist for your .htaccess file.

Per Søderlind

<p>Based on a users IP address, WP-DenyHost will block a spammer if he already has been tagged as a spammer. Use it together with the Akismet plugin. Akismet tags the spammer, and WP-DenyHost prevents him from accessing you site.</p>
<p>If you have a <a href="https://www.cloudflare.com" rel="nofollow ugc">CloudFlare</a> account, the plugin can add spamers to <a href="https://www.cloudflare.com/threat-control" rel="nofollow ugc">CloudFlare Block list</a></p>


WP-DenyHost

WP-DenyHost denies a spammer from accessing your WordPress site. WP-DenyHost can add spammers to the CloudFlare Block list

Block Top Spammers vs WP-DenyHost