We've sort of run out of IPv4 addresses; you can't get new ones direct from ARIN in a timely fashion anymore. You can still get IPs from most of the other regional authorities though. You can also get IPv4 addresses from other people who aren't using them; there's still a lot of addresses that are assigned, but not BGP advertised, so there's some slack.
However, IPv6 is happening. Primarily in two places:
a) mobile ISPs; T-Mobile is big on IPv6, so is Jio in India. This tends to be related to new investments or wealthy countries. Existing networks work enough, so where there's not a lot of money, adding or upgrading CGNAT is small incremental cost, and enabling IPv6 is a project. OTOH, a big new network like Jio has to pick from building out IPv6 with a small amount of IPv4 or buying a bunch of IPv4 to build out a lot of IPv4 -- it makes sense to push hard on IPv6.
b) big content sites. IPv6 networks currently don't have the same kind of junky middleboxes that IPv4 has --- serving as many customers as possible without junk in the way is a big deal.
Where you don't see a lot of movement is residential ISPs in wealthy countries. They've generally got enough IPv4 for their customers, so they don't care that much about IPv6. However, Comcast has done a good job of rolling out, and AT&T and CenturyLink do have something.
However, IPv6 is happening. Primarily in two places:
a) mobile ISPs; T-Mobile is big on IPv6, so is Jio in India. This tends to be related to new investments or wealthy countries. Existing networks work enough, so where there's not a lot of money, adding or upgrading CGNAT is small incremental cost, and enabling IPv6 is a project. OTOH, a big new network like Jio has to pick from building out IPv6 with a small amount of IPv4 or buying a bunch of IPv4 to build out a lot of IPv4 -- it makes sense to push hard on IPv6.
b) big content sites. IPv6 networks currently don't have the same kind of junky middleboxes that IPv4 has --- serving as many customers as possible without junk in the way is a big deal.
Where you don't see a lot of movement is residential ISPs in wealthy countries. They've generally got enough IPv4 for their customers, so they don't care that much about IPv6. However, Comcast has done a good job of rolling out, and AT&T and CenturyLink do have something.