I removed my custom domain name on Github Pages, removed all github records from my DNS registrar, and added an A record that had nothing to do with Github. However, two hours later, visiting to my custom domain name still resulted in a 404 page of Github Pages. Ping my custom domain name and I still get four IP addresses of Github Pages. I confirm that there is no CNAME file in my rep.
What the hell is going on here? I have cleared my browser cache and tried to test on browsers on different devices, but still failed? It’s frustrating.