buckworks - 4:51 am on Nov 22, 2009 (gmt 0)

There's a good chance that this situation is accidental, not deliberate and not malicious.

I had the same thing happen a few months ago when I moved to a new server. Someone else had two domains still pointing to one of the IP addresses that was new to me but had been his in a previous contract. The content for one of our sites was showing up under those domains as well as for the real domain.

We spotted the problem because of some odd referrers in our analytics, and we solved it by phoning the owner of the "rogue" domains, getting him to look at what was happening, and asking him to update his DNS. He did so very quickly after he understood the problem.

If you can track down a contact for the problem domains, make a polite request that they update their DNS. You might or might not get cooperation, especially if language is a barrier, but it's certainly worth a try.