How do you obtain your IP address for your PS3?

Your PS3's IP address is either assigned by your router, if you're using one. It will appear as 192.168.0.xxx Or it is assigned by your modem if you are not using a router.

Your IP address could constantly change, if it is not static, unlike your PS3's MAC address, which is always the same.

An internet Protocol (IP) address is an identification number that is assigned to every device that is connected to the Internet. Each IP address is unique; it consists of four sets of numbers that are separated by three dots. Your PlayStation 3 console will have an IP address if it is connected to the Internet. Your PlayStation 3's IP address can be found by accessing the console's "Settings" menu.