you cannot hack their address.. you can only hack their local service provider and get a general sense of the area that they live in based on their internet connection and the near-by connection server that they run on..

in other words you can't find out whose computer it is based on their unique computer address unless you have a sense of their location, there isn't a database of computers attributed to their owners, only computers attributed to areas.

That's the science of the U.S.'s FBI investigations of people who break federal laws over computers in any case.

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