An "unblocked GitHub.io" site refers to a GitHub Pages website specifically designed to bypass internet filtering or access restrictions—typically enforced by:
There might be an issue with your DNS settings. Try changing your DNS to a public DNS service like Google Public DNS (8.8.8.8 and 8.8.4.4) or Cloudflare DNS (1.1.1.1 and 1.0.0.1) to see if that resolves the issue. unblocked github io