[p1mrx]

> an ip address for every grain of sand in the universe

https://en.wikipedia.org/wiki/Observable_universe estimates 10^53 kg in the observable universe.

10^53 kg / 2^128 = 10^14 kg per address, though I have no idea what fraction of the universe is sand.

In practice, the number of allocations is much smaller because IPv6 is effectively a 64 bit address space, with the second half reserved for edge networks.

> There's something to be said about a human readable IP address.

Is 2a01:4f8:1c1c:f6aa::1 really so unreadable, given that every device needs a different number?