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Unfortunately this is not the fact. While some ISPs are experimenting with IPv6, the vast majority are not on that train. Indeed, IPv4 address space has practically run out in China already, but many ISPs are taking the nasty NAT-like approaches, Carrier-grade NAT [1] for example. And it is particularly common in mobile. So far, IPv6 is only (relatively) well accepted among universities (CERNET [2]).

[1] https://en.wikipedia.org/wiki/Carrier-grade_NAT [2] https://en.wikipedia.org/wiki/CERNET