What happens when the Internet addresses run out? That question has been generating growing concern among Internet operators and policy analysts. The problem is fundamental to the future of the Internet. This blog post is part of a paper that evaluates a transitional policy that Internet governance agencies are considering as a response to the depletion of the IPv4 address space. In particular, it focuses on proposals to allow organizations holding IPv4 addresses to sell address blocks to other organizations willing to buy them. IP address transfer markets, as they are called, have been proposed as a pragmatic way to extend the life of the legacy IP address space.   more »