This is a web-based application that can check the registration status of a domainname. This is a realy good solution for hosting providers, that wants to let it's users to check if a domainname is still free for registration or not. I've made this for a view small hosting providers, and after some development (5 years) I've now got the best domain checkup script ever! ;) (mrrff, smelly isn't it?) It's not using any system calls! It's opening a socket to the whois server. So it should run on any server with PHP4 or higher installed! Download, untar, upload to your server and point your browser to the whois.php, and you're ready for business! If every thing was that easy.