PSYCHOS  Wow, I feel sorry for anyone exploited by this developer.

You can obviously do this quite well either from the shell, or from one MANY tools on the web if you don't want to use the shell. And most of those online tools give you better output; this doesn't even appear to support rwhois and other needed features.

Again, if you have paid this developer money...I am sorry you had to get ripped off.  
(Version 2.0)

STONETOWNMIKE  You can do it for free at http://samspade.org/  
(Version 2.0)

SJK  And exactly how is QuickWho an improvement over the Whois tab of the bundled Network Utility app that lets you select a whois server? Sorry, but this sure comes across as a suckerware product.  
(Version 1.0)

TFJ222  Have you tried Network Utility.app. Free from Apple in the Utilities folder.  
(Version 1.0)

JOELLEVIN  $20? Are you kidding me? Why not just open the terminal do it by hand, it's just as fast and free. Or, what about going to whois.org and doing their free domain lookup? I was about to download this, but the fact that it's $20 is a huge turnoff... if I really wanted a GUI app equivalent to this, I would just write one for myself for free in 10 minutes.

Give us some powerful features not available elsewhere if you're looking for $20.  
(Version 1.0)