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There isn't really a way for the browser to know if it's your ISP that doesn't support IPv6 or the site itself. It would have to ask an external host what your IP address was, then look up that address in a database of ISPs, then check to see if the ISP supports IPv6.

Edit: there is an extension that tells you if the site loaded in IPv4 or v6, but it can't tell you why. Firefox https://addons.mozilla.org/en-US/firefox/addon/ipvfox/ and Chrome https://chrome.google.com/webstore/detail/ipvfoo/ecanpcehffn...




Good point, but I think that making a database with this information would certainly be doable for companies like Microsoft and Google.




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