I have looked into the way Internet Service provider's Dynamic Host Configuration Protocol works as far as I know about such technology, and from my research I concluded: the IP given by your ISP's DHCP will remain to the Media Access Control device.
For example: you have a router connected to the cable modem - this router has a single MAC address therefore you will always have the same external IP, as soon as you change the router (or plug the modem directly to your PC's Network Interface Card) you will get a different external IP. This IP remain the same as long as the NIC's MAC is the same.
Note: these tests were performed on a cable internet service by Rogers Communications Inc. in Canada, and do not apply to DSL internet service providers who seem to change external IP often unlike cable internet service providers
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