Online Site Down Checker Tools.

Domain: github.io is up from here.
Status Code: 200 OK
Primary IP: 185.199.109.153
Local IP: 68.65.122.155
Primary Port: 443
Local Port: 443
Response Time: 25.943 ms
Effective URL: https://pages.github.com/

WEBSITE NOT WORKING

This real-time website checker performs an independent site down or not test if you have encountered a website not working problem. We communicate with the given domain’s web server and a website down message is displayed in case of: server not responding, client error or server error http status codes. Please note, that we are currently unable to examine the functionalities of a site (e.g.: login, forum) or the page content itself, therefore you may get a site up message even if a blank page is loaded for the domain name.