Even though it was announced at WWDC, I'd completely missed the fact that supporting IPv6 will be a requirement come the beginning of next year. Luckily, it's probably not going to be a huge deal for most apps. The short version is to make sure you're using NSURLSession and friends instead of the older APIs, and don't hardcode any IPv4 addresses. There's more information, including details on how to easily test with an IPv6 network, in the first half of this WWDC video.

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