I wouldn't know where big company's go for there hosting but I'm guessing they will have there own team of master computer dudes that come with there big chunky servers and host there own.

You can use the Whois database to find out who owns the domain as company's often register the domain and host with the same people.

http://www.whois.net/

Sorry I couldn't give you more a precise answer I can't say I have friends in high places such as IBM or EA

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