FasterThemes

<p>Quick Whois WordPress Plugin Shows whois information of the provided domain name.  You can use Widget in the sidebar or you can also use Shortcode in the pages/posts.</p>
<p><a href="http://whois.fasterthemes.com/" rel="nofollow ugc">DEMO of Quick Whois plugin</a></p>
<p>Features:</p>
<ul>
<li>You can use this plugin in your sidebar by dragging and dropping “Quick Whois” Widget.</li>
<li>You can use this in any specific page/post by putting shortcode [quick_whois].</li>
<li>This plugin converts your website into a whois data provider website in a few seconds !</li>
</ul>
<h3>License and Copyrights for Resources used in this plugin</h3>
<p>i) We have used phpwhois.org php script from this website http://www.phpwhois.org Copyright which is a free software and we are allowed to redistribute it and/or<br />
modify it under the terms of the GNU General Public License v2.</p>
<pre><code>For any help you can mail us at support[at]fasterthemes.com
</code></pre>


Quick Whois

Quick Whois Plugin Shows Whois information of the provided domain name.  You can do this using Widget/Shortcode.

nullamatix.com

<p>IP Intelligence provides the ability to retrieve information about commentators IP from within the WordPress admin section.</p>
<h4>Feature Summary</h4>
<ul>
<li>Reverse DNS/PTR</li>
<li>Long/Proper IPv4 Format</li>
<li>Country of Origin (ipinfodb.com)</li>
<li>Region or State (ipinfodb.com)</li>
<li>City (ipinfodb.com)</li>
<li>Timezone (ipinfodb.com)</li>
<li>Spamcop.net Status</li>
<li>StopForumSpam.com Data</li>
<li>Whois Detail (whois.net)</li>
</ul>
<h4>Further Analysis</h4>
<p>The plugin also provides targeted/dynamic links to the following destinations for further research:</p>
<ul>
<li>Google Search Query</li>
<li>Google Groups Search Query</li>
<li>Project HoneyPot</li>
<li>Spamhaus</li>
<li>OpenRBL</li>
<li>Robtex (Lucky)</li>
</ul>


IP Intelligence

I am amazed ipinfodb still recommends this plugin.



super old, not updated for 7 years

Provides the ability to retrieve information on a commentators IP address without leaving the "edit-comments.php" page.

Quick Whois vs IP Intelligence