Context:
People have been asking for IPv6 Support on GitHub since years (probably a decade by now)
... and someone even got so annoyed that they decided to setup a dedicated website for checking this: https://isgithubipv6.live/
this post was submitted on 09 Jun 2024
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The perpetual chicken egg problem of IPv6: many users don't have IPv6 because it's not worth it because everything is reachable via IPv4 anyways because IPv6 only service don't make sense because they will only reach a subset of users because many users don't have IPv6.....
Honestly this isn't even true anymore. Most major ISPs have implemented dual stack now. The customer doesn't know or care because it's done at the CPE for them.
I use a browser extension which tells me if the site I'm at is 6 or 4 or mixed. In 2024 most major sites support V6. A lot of this is due to CDN supporting it natively.
The fact that GitHub doesn't is quickly becoming the exception.
IPv6 traffic is globally steady at around 37%. So it isn't a majority by far.
https://www.google.com/intl/en/ipv6/statistics.html
Globally it's at about 47% and growing at about 4% per year. If the rate remains unchanged it'll be about a decade for >95%.
But the reality of it is, you don't need global adoption out of the box. You just need majority adoption in the countries you visit, which for me are western countries (north America and Europe) which now have a majority adoption.