I built a website for a client, who insisted on managing the domain themselves. I think it was owned by the maker of their previous site.
Anyway they now want me to take control of the domain, but the current owner has seemingly disappeared off the face of the Earth! He won't answer his phone or his emails. I don't think it's anything malicious- the domain is still pointing to my site. It's just that he's changed all his contact information.
Who governs domains, and how would I go about contacting them? If it was a uk domain, I would be contacting Nominet. But it's a .net domain.