check if your domain name was really hijacked

5 Things to Do In Case of Domain Hijacking

You just awoke to find your domain name has been hijacked and your website is down, your site replaced by ads for sexual performance enhancing products. Your domain is now owned by an individual in Thailand with a phony name and address.

Or, perhaps you operate a successful on line business in the U.S. and learn someone in Australia has copied your entire site, and launched an Australian version of the site as their own, using your trademark in the domain but with an .au ending?