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What does an I.P. address tell you?

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I've been banned from 4chan T_T But the thing is.. I don't recall the post it's talking about. It's telling me my I.P. address. But can more than one PC have the same I.P. address? Like , sharing a wireless connection - could that give you an identical I.P. address 'cause I seriously doubt it was me that posted.. Any explanation? :/