IMPORTANT: We encourage you to adopt address-family agnostic APIs rather than to maintain separate code paths for IPv4 and IPv6. You don’t need to remove all references to IPv4-only constructs from your app as long as they behave correctly in an IPv6-only environment.
Note: You can turn off WWAN using Settings > Cellular > Cellular Data (for English localizations outside of North America use Settings > Mobile > Mobile Data). This will ensure your device is using the IPv6-only Wi-Fi. IMPORTANT: If you’re testing with a WWAN-capable device, make sure to turn off WWAN before running your test. If you don’t have one, you can set up a test network by following the instructions in Test for IPv6 DNS64/NAT64 Compatibility Regularly. You should test your app on an IPv6-only network. Testing your app in an IPv6-only environment Make sure to test for IPv6 compatibility before submitting your app to the App Store for review.įor more information on supporting IPv6 networks, review Supporting IPv6 DNS64/NAT64 Networks. However, if your app utilizes IPv4-specific APIs or hardcoded IP addresses, you'll need to make changes.
A majority of apps will not require any changes as IPv6 is already supported by NSURLSession and CFNetwork APIs. As of June 1, 2016, all apps submitted to the App Store must support IPv6-only networks.
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