This is actually one of the most interesting parts of the Urbit project IMO -- their addressing scheme has 8, 16, 32, 64, 128 address support. The addresses are

This is actually one of the most interesting parts of the Urbit project IMO -- their addressing scheme has 8, 16, 32, 64, 128 address support. The addresses are displayed in memorable terms that fit into an astromoical-styled system. A /8, an example being "~rel" (one syllable names based out of a bank of 256 memorable 3-letter syllables)-- these are galaxies and are extremely rare (128 galaxies total). Then you have /16 stars which are like "~tabrel", combining two of these syllables -- their are 64,000 stars. And then finally, you have /32 planets like "~sampel-tabrel", which are 4b illion and enough to be valuable and stop spam, but are somewhat disposable kind of like a phone number. Each one of those planets can spawn billions of /64 moons (sampel-tabrel^dambel-gabnel) which can be used for IoT or family members.This naming scheme draws a good delineation has both human understandable names and memorable addresses you can use for a lifetime -- as well as tremendous scalability to support routing between trillions of addresses. https://urbit.org/blog/value-of-address-space-pt2 https://urbit.org/blog/value-of-address-space-pt2