The major differences between an External IP Address and an Internal IP Address are: The IP Address that your ISP (Internet Service Provider) uses on its network is External IP Address. It is fundamentally governed and assigned by your ISP and you can never change or modify it. You can find it by Internet>modem>computer.

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How to Find Your Local and External IP Address

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How To Find Your Router's IP Address - port forward Each router has 2 IP addresses: an internal IP address and an external IP address. Your router's internal IP address is what you use to talk to your router. Use this IP address to login to your router and configure it for things like port forwarding. Your router's external IP address is what the rest of the world uses to find you on the Internet. Difference between Internal and External IP Address