How to de-index the server location of my website

[webtarget]

Somehow my website is indexed by it's server location. So in addition to www.[example].com, it's also indexed like this:

server123.[server name].com

I have no idea how that happened. But, I was wondering, does anyone know how to de-index all the urls like this? I have a lot of urls indexed using my server's address.

Thanks.

[AlanMosley]

do a 301 redirect to the canoniocal domain name.

here is how to do so for microsoft servers.

http://thatsit.com.au/seo/tutorials/how-to-fix-canonical-domain-name-issues

[webtarget]

Thanks.

Although, it just occurred to me that it's no different than changing [example domain].com to www.[example domain].com, using an htaccess file to redirect, which I can do.

[AlanMosley]

Yes thats correct, check the HTTP_HOST is correct, if not redirect to correct one. then all domains will redirect