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Moreover, is a computer's IP address unique?

IP Addresses and Domain Names Computers connected to the Internet must speak the "Internet language" called the "Internet Protocol" or simply "IP." Each computer is assigned a unique address somewhat similar to a street address or telephone number.

Also, are all IP addresses different? Even though the internal IP is a different IP address, it's on the same network and all devices connected will share the same external IP. However, each connected device will have a different IP address from any other internal device.

Similarly, how many unique IP addresses are there?

But it is, in a way, the end of the Internet as we know it. Those last 130,000 IP addresses are what's called IPv4 addresses, established by ARIN in the early 1980s according to a 32-bit numbering system protocol that allowed for the creation of about 4.3 billion unique addresses.

Can two devices have same IP address?

As I understand it, two computers cannot have the same public (external) IP address unless they are connected via the same router. If they are connected via the same router, then they can have (share) the same public IP address yet have different private (local) IP addresses.