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You can't really. the dhcp server will lease IPs on a time basis (1 day, 1 week, etc.), depending on how it's setup.
Are you using a router or anything like that to access the internet? If so, ipconfig will not do anything for you. You will have to renew it via the router. Either way, chances are that the dhcp server you are pulling your IP from may be doing caching, which it why you usually get the same IP address.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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