I googled it. "Every device in your network will have its own IP address. The external IP address that the Internet sees is actually assigned to your router. If you go to a website like www.ipchicken.com you can see how it will indicate the same IP address from any computer inside your network. That's because all the Internet sees is your router's external port. Computers inside your local network will typically get their IP addresses assigned by your router, which keeps track of the addresses assigned and "translates" the incoming responses from the Internet to the proper internal IP address which is not visible outside of your network. Each Internet Service Provider (ISP) owns blocks of IP addresses which they assign to their users as they connect to the internet. So, even if you don't change ISPs, your external IP address can change from time to time (although for a price, you can get a permanent address). If you change ISPs, you will get to "borrow" IP addresses from a whole new block of addresses'
