That table isn't very helpful. What does it mean for Arch Linux to have IPv6 support? When you say "Amazon" doesn't have IPv6 support, do you mean AWS, the retail store?
It would be better if instead of linking to say, archlinux.org, you link to the actual page describing what specifically about Arch is IPv6, same for all the other endpoints. I would also replace the support sentence with a green/yellow/red color checkbox, and get rid of the twitter link.
Generally, when people write "Amazon" they mean the store (amazon.com) and when people write "AWS" they are referring to the infrastructure provider.
I agree that the URLs being tested should be visible on the page, so you don't have to lookup the source.
With that said, not sure how useful it is to say that (aur.)archlinux.org has IPv6 enabled, what you really care about is the repositories and so on, but those are all spread out so it'll be hard to test all of them. At least could test the official mirrors.
It would be better if instead of linking to say, archlinux.org, you link to the actual page describing what specifically about Arch is IPv6, same for all the other endpoints. I would also replace the support sentence with a green/yellow/red color checkbox, and get rid of the twitter link.