How do you check where a site is hosted?

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The review of this web host was started by jani on 2009-08-14 21:46:32:

I use this site www.whoishostingthis.com but I think it is not accurate because it is not showing the correct site where my own sites are hosted.

My sites are hosted at Hostgator & Namecheap but when I check there it says ThePlanet.com, sometime say Liquidweb.com.

How do you check?

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