The world is running out of IPv4 addresses. In fact, in parts of the world, the available pool of IPv4 addresses is exhausted, which means that network operators who remain solely IPv4-based must utilize extensive Network Address Translation (NAT) schemes in order to reuse the limited supply of IPv4 addresses available to them. In turn, this means that these IPv4 addresses are transient and cannot practically be assigned to any particular device on a permanent basis. This is why IPv6 was developed: To bring a vastly larger addressing space and enable virtually any intelligent device in the world to be assigned its own unique address. Clearly, IPv6 is the future of Internet networking.