How do you release and renew an ip address?

In Windows operating systems, open a command prompt and type "ipconfig /release," which dumps the automatic address it had, and then "ipconfig /renew," which gets a new address, which will be in the address space that you just changed the router to. Of course you won't type the quotes, and depending on which Windows version you have you may need to make it "release all" and "renew all."

For Mac OS, either restart your computer, or go to the Apple menu, choose System Preferences, choose Network from the View menu, and then Active Network Ports from the View menu. Deselect the "ON" checkbox for your network adapter, click on Apply, then reselect the "ON" checkbox and click Apply again.

Finally you can check your new ip address at IP-Details.com