How do you look to buy a website address that is owned by somebody else?

Hi,

Anybody know how to contact the owner of a URL that is not in use but is registered?

Thanks!

You might be better waiting to see if it expires, and then you can pick it up for a song.

Try looking the domain up on a service like www.whois.net or nominet. The registrant details are sometimes shown.
Other than that you could try sending an email to info@thedomainname and see if you get a reply as probably routed to the registrant.