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ELBs (Classic and Application) do support IPv6. You can CNAME or ALIAS to dualstack.[elb-name].

The endpoints are available but traffic silently fails when you are in a VPC.

I was primarily referring to EC2.

Why do you need IPv6? It seems pretty unnecessary in a VPC.

> Starting June 1, 2016 all apps submitted to the App Store must support IPv6-only networking.

IPv4 traffic over IPv6 is permitted, though. They just want you to use APIs that work independently of the underlying decision to use IPv4 or IPv6.