IPv6 compatibility

Cloudflare enables IPv6 on all domains without requiring additional configuration or hardware (as long as your host provides IPv6 support).

When IPv6 compatibility is turned on, Cloudflare auto generates AAAA DNS records to allow IPv6 clients to connect. On the other hand, when IPv6 compatibility is turned off, Cloudflare does not automatically generate and advertise AAAA DNS for the zone. Client software will determine whether to use IPv4 or IPv6 to connect to a hostname that supports both methods.

For proxied DNS records that have both an IPv6 and IPv4 origin address, Cloudflare will prefer the IPv4 address when connecting to your origin server.