The NRO issuing its final IPv4 address blocks shouldn't mean a big change for end users. The switch to IPv6 is already well under way and much of the central infrastructure of the Internet is already running on the protocol. While vast portions of the network are yet to be converted, there doesn't appear to be a last-minute rush for IPv4 addresses. That indicates "strong momentum" behind the adoption of IPv6, NRO said.
The NRO acts as a coordinating body for the five regional Internet registries, which are: AfriNIC, serving Africa; APNIC, serving the Asia-Pacific region; ARIN, serving North America and many Caribbean nations; LACNIC, serving Latin America and some Caribbean nations; and RIPE, serving Europe, the Middle East and parts of Central Asia.