The last 5 blocks of the IPv4 addresses were given away this morning to Regional Internet Registries so they can assign them. But once they run out, which would be very soon, it’s game over for IPv4 operations, since no new hosts would be able to connect publicly. IPv6 adoption? So small that most consumer products out there still don’t support it. Also because almost all ISPs out there don’t provide it, or if they do, it’s just beginning as a “trial”.
Source: http://arstechnica.com/tech-policy/news/2011/02/river-of-ipv4-addresses-officially-runs-dry.ars