Since IP addresses are tightly tied to the network architecture, how can they ever be liquid?
How are PI addresses tightly tied to network architecture?
What percentage of the total IPv4 address space is PI? If non-PI addresses are not property then how do PI addresses gain that attribute? --Michael Dillon P.S. PI addresses get configured into devices just the same as non-PI addresses. If you could sell a PI block then you would be faced with the prospect of renumbering all those devices. DHCP makes end-user devices pretty easy, but devices in the NETWORK ARCHITECTURE pose more of a problem. In addition there are some people who use IP addresses encoded in hardware in a non-mutable fashion. Those people will apply for PI allocations which, on average, makes PI addresses more tied to the hardware than non-PI. But the important points are not the ones mentioned in this postscript.