OK, it turns out Mike Ballon&#39;s example won&#39;t work.<div><br></div><div>Let me try to re-phrase the question:</div><div><br></div><div>I have this rogue ISP/Webhost/Webdesign company - call &#39;em &quot;badguycorp&quot;.  I don&#39;t want to say their name.  They are hosting websites that are legally and/or morally questionable.</div>
<div><br></div><div>I want to find those websites.</div><div><br></div><div>I have half a dozen or so known example domains that &quot;badguycorp&quot; is hosting/running.  Looking at their whois data, I know that the main point of commonality is the name servers.  All of them end in <a href="http://badguycorp.net">badguycorp.net</a> - with different stuff preceding those.  For example:</div>
<div><br></div><div><a href="http://ns3.tre.badguycorp.net">ns3.tre.badguycorp.net</a></div><div><a href="http://ns2.fds.badguycorp.net">ns2.fds.badguycorp.net</a></div><div><a href="http://ns1.jhg.badguycorp.net">ns1.jhg.badguycorp.net</a></div>
<div><br></div><div>So.  What I need to do is trawl for whois entries where the name server(s) end in &quot;<a href="http://badguycorp.net">badguycorp.net</a>&quot;, and report what those websites are.</div><div><br></div>
<div>Is there a way to do this, by any method, Linux command line or otherwise?</div><div><br></div><div>Thanks!</div><div><br></div><div>Jim</div>