The following sites are only reachable via IPv6.
If you have a legacy connection which is not IPv6 capable, all of the sites below will fail to load.
Due to deficiencies in all current browsers, attempting to load IPv6-only websites from a legacy connection will display a generic error message such as "NXDOMAIN" or "host not found" which gives no clue as to what the problem is.
You can test your connectivity at a variety of sites such as https://ip6.biz a modern connection will show "IPv6: Supported" in green.
If you do not have IPv6 connectivity you should check the configuration of your device and/or router, or contact your ISP.
If you're unfortunate enough to only have legacy connectivity, you may be able to get access to the modern IPv6 Internet by using a service such as Cloudflare Warp, which works by using your out of date local connection to tunnel traffic via Cloudflare servers.
You can also use a website availability check such as https://testmyconnection.net to verify that the below sites are online. Simply copy the URL and check.
Note sites listed below with neither HTTP nor HTTPS are still IPv6 only, but are used for something other than web hosting.
For any queries/comments/feedback on this list, please contact bert [at] v6list [dot] firenzee [dot] com
There are a total of 447689 IPv6-only hosts in the database.