Yearly reminder that github still does not have an IPv6 address (2023)
Try the following:
$ nslookup github.com [...] Non-authoritative answer: Name: github.com Address: 140.82.121.3
See also the completely ignored post in their forums.
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Also a reminder for me to add IPv6 support for my personal site. I think most cloud providers are able to offer dual ipv4/v6 support if you ask for it/configure it.