What does the IPv6 Compatibility option mean?

The IPv6 Compatibility setting will enable IPv6 on all subdomains that are Cloudflare enabled (marked by an orange cloud in your DNS settings).

Note that if your host provides IPv6 support on your backend, this setting will allow you to proxy IPv6 connections through Cloudflare's global network by toggling the gray clouds next to your AAAA records on the DNS settings page to orange.

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