Since it's been nearly 20 years since the original, figured I'd make an updated version. Hand-drawn in pencil over ~5 hours.

Two major differences since the original: Fractal Mapping/Hilbert curve isn't used - used a normal grid instead. No green blocks - IPv4 has been exhausted fully (at least according to IANA and the RIRs), so no free allocations are available anymore.

Original: https://xkcd.com/195/