Oh it’s way more than that!

After looking up some numbers, I note we could give every single square MILLIMETER on the planet its own entire IPv4 address space.

…And then every one of those IPv4 addresses could have its own entire copy of the IPv4 address space!

…And that would just be a drop in the bucket compared with IPv6! One good comparison I’ve seen is that you could assign an address to every atom on the surface of the earth (but not inside it) and have enough left over for 100+ more earths.

Rough math for the square millimeters:

The surface area of the earth is roughly 510 trillion square millimeters. Let’s round that up to a quadrillion or 10¹⁵.

The number of IPv6 addresses is 2¹²⁸ or 3.4x10³⁸. To be conservative again, let’s just round that down to 10³⁸.

10³⁸ / 10¹⁵ = 10²³ IPv6 addresses per square mm of earth.

IPv4 address space is 2³² or around 4 billion. let’s round up to 10 billion or 10¹⁰.

So then 10²³ / 10¹⁰ = 10¹³ IPv6 addresses per IPv4 address per square mm of earth.

10¹³ / 10¹⁰ =

1,000 IPv6 addresses per IPv4 address per IPv4 address per square mm of earth.

And that was with the conservative estimates along the way. I think it would actually be tens of thousands.