Internal IP vs External IP

External or Public IP address is used across the entire internet to locate computer systems.

Internal or Private IP address is used inside a private network to locate the computers and devices connected to it.

Both allows each machine present on internet to be located.

	Internal IP	External IP
Assigned by	Local area network router	Internet service provider(ISP) server
Used for	To access the local devices inside a local area network(LAN).	To access the computers and devices(websites) across the entire internet through WAN.
Scope	Seen by other computers in a network.	Seen by every one on internet.
Accessibility	To devices within the network.	To devices across whole internet.
Work upto	Works within the limits of router.	Works beyond router to access internet.