Japan has an IPv4-like block system: a typical address is Prefecture City District 1-2-3-45, with 1-2-3 representing increasingly small divisions and the (opti

Japan has an IPv4-like block system: a typical address is Prefecture City District 1-2-3-45, with 1-2-3 representing increasingly small divisions and the (optional) 4th element representing the apartment number. https://en.wikipedia.org/wiki/Japanese_addressing_system https://en.wikipedia.org/wiki/Japanese_addressing_system