"hello.world.ipv6" is not valid for 2001:470:912e::7f. Whoever has this needs to fix it.
loool
ok
where you found that message?
In my web server logs - when the person to whom this is allocated tried to access my avatar (personalized picture) while reading a forum posting I had made. I supply the image by a link back to my server.
I use a custom format that logs the IP address and related hostname of the requestor. (It also denies access via a 403 error to those that have invalid DNS entries - and this was likewise denied.)