GitHub Pages Legacy IP Desprecation

このブログはmiddlemanを使ってGitHub Pagesで無料運用しているのですが、deployしてたら警告メールがGitHubから届くようになっていて、あまり中身を気にしないでいました。

で、久しぶりにdeployしたらGitHub Pagesに反映されなくなりこんなメールが届きました。

The page build failed with the following error:

The custom domain for your GitHub Pages site is pointed at an outdated IP address. You must take immediate corrective action to ensure that your site remains available after December 1st, 2014. Additional details can be found at For more information, see

If you have any questions please contact us at



Don’t have the GitHub Pages Gem?

If you’re on a Mac or Linux machine, simply paste this command into a terminal window, replacing with, your site’s domain. dig | grep -E ’(||’ || echo “OK”. If you see the word “OK”, you’re all set. On a Windows machine, you’ll want to run nslookup and ensure that the output does not include any of the deprecated IP addresses (207.97.227.XXX, 204.232.175.XX, or 199.27.73.XXX).||