Who is domain question

Hi, - Please help!

I know is is possible to find out who owns/ registered a domain/ site. My
question is....Is there a way of finding out what domains are registed to an
individual or company?

For example coca-cola - How do I find out all the domains registed to them,
without knowing the domain names?

or

Joe Smith of London - How can I see what domains he owns with knowing them?


Would be really grateful for any help. Thanks.