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I use the SixOrNot browser extension to see which sites have IPv6 enabled (and to test the IPv6 on my own website). Yep, YC has been IPv4 for a good long while.

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There's also IPvFoo[0] for those on Chrome (it supports Firefox too, but is a bit buggier there).

[0] https://github.com/pmarks-net/ipvfoo

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