FasterThemes

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.
<a href="http://whois.fasterthemes.com/" rel="nofollow ugc">DEMO of Quick Whois plugin</a>
Features:
<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>
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 
modify it under the terms of the GNU General Public License v2.
<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.

Mahamodul Hasan Khan

dnsLT is a little tools for Searching Domain whois & showing in any kind 
of WordPress Site. You don’t need to do a simple code for that. Just put 
the ShortCode in your page or post or anywhere it will show a search 
form for domain whois. Then your visitor will able to search any domain 
whois from there. You can config colors with your site color from admin 
settings in free version. also can do many things from pro version.

dnsLT Free domain name whois

A plugin for search domain whois from your lovely web site.

Quick Whois vs dnsLT Free domain name whois