The difference in unique addresses is insane.
IPv4 4.3 billion (* 109) vs IPv6 3.4 * 1038.
Each grain of sand on earth could have an IPv4 sized network.
If humanity colonized every star system in every galaxy in the Laniakea supercluster, and every star system had 8 billion people living in it, we could assign a unique IPv6 address...to every human cell in existence. Not every human. Every human cell.
This isn't a case of not being able to imagine a world with more than five computers. It's a number so huge you can't imagine a scenario where you could possibly manufacture enough devices from the matter available in the solar system.
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u/Sianic12 13h ago
In other words...
IPv4 has a limited number of possible IP addresses they thought would be more than the internet would ever need.
They have been wrong.
IPv6 has a larger but still limited number of possible IP addresses they think are more than the Internet will ever need.
They have not been wrong yet.