Depends on the ISP. For some people, simply rebooting their router gets a new IP. Others have to explicitly tell it to release the IP and then renew it. Othe

Depends on the ISP. For some people, simply rebooting their router gets a new IP. Others have to explicitly tell it to release the IP and then renew it. Others have to change their router's MAC address. I know that personally, if I release it and renew it, I'll get assigned the same IP. Though my IP is technically dynamic, it hasn't changed in the 5 years I've been in this house. I haven't tried changing my MAC address, but with a previous ISP, I had changed my router's MAC and it wouldn't even get an IP at all until I changed it back. Makes me wonder what would happen if I had changed it to the MAC of a router being used by another customer...