How much of the world uses IPv6?

Since it's been around longer, IPv4 is more widely used, but IPv6 adoption is growing as addresses on the older IP run out. According to Google data, around 40% of the world has adopted IPv6 as of June 2023. Google also breaks down that data by country, which varies pretty widely. The U.S., for example, is at over 50% adoption while Australia is at just over 29%, Sweden is at 19%, and Argentina is at 18.4%.