In support pages of cloudflare This is wrtten when we try to turn off IP6 compatibility
Why can’t I turn off IPv6?
At Cloudflare we believe in being good to the Internet and good to our customers. By moving on from the legacy world of IPv4-only to the modern-day world where IPv4 and IPv6 are treated equally, we believe we are doing exactly that. In the Cloudflare dashboard, IPv6 is no longer something you can toggle on and off, it’s always just on. However, if you need to turn off IPv6 (and say goodbye to the modern internet), you may still do so using the Cloudflare API.
But the site I mentioned is working perfectly fine without this compatibility. I am really confused why we need IPv6 compatibility.
They’re pretty much run out of IPv4 addresses, so IPv6 is the next step. Cloudflare is ready for this, and if you can use IPv6, you should. It won’t be long until you just can’t get an IPv4 address for new hardware. At some point, it would be nice if hardware would stop routing IPv4.
Not likely. Something that’s all-out IPv6 can’t connect to IPv4. For example, I can spin up an IPv6-only instance at Vultr. That box can’t connect to anything that’s IPv4 only…which is a bummer because some software repositories are IPv4-only.