according to ARPAgeddon (IPv4 Countdown), there are less than 240 days until there will be no more IPv4 addresses to hand out to people, and the conversion to IPv6 is going less-than-smoothly.
the problem is with NAT (Network Address Translation) and wireless “devices”, mostly in china. instead of “dotted quad” 32-bit addresses – something like 18.104.22.168 – that typify IPv4 addresses, the new IPv6 addresses have 128 bits, and the “Network Address Translation” software, which works in theory, is still a little slow off the mark when it comes down to actually doing the kinds of “translation” it is designed to do.
US.gov set IPv6 upgrade deadlines, but they’ve targeted 2012 for completion and, as i said, there will be no more IPv4 addresses long before that happens. my own computer has IPv6 software, but i had to disable it because it wasn’t working correctly, and, as far as i have been able to tell, there hasn’t been an upgrade package that has included a fix for IPv6 in at least 6 months.
presumably there are enough people that have functioning IPv6 computers that eventually the switch will be made, but until then, there will be no new addresses, and/or an only partially functioning internet with IPv4 computers that may or may not be able to connect…