Setting up DNS is easy, isn't it? Many times you do not even do it, because your hosting does it for you. You then just check your site is accessible and that's it. But DNS is quite a complex system and there are issues you might not even know they existed. The fact that it works for you perfectly does not necessarily means that it works for everyone. You can now check your DNS Zone with our new tool called DNS Zone Health Checker. It uses over 200 rules to check whether your DNS record setup and name servers configuration is right. It checks and validates everything from name server connectivity and resource record syntax to DNSSEC and IPv6, and it also supports IDN. As the report is intended for experts, if you see any errors and do not understand what it means, just share the result with your domain administrator or ask your hosting/registrar for a help.
Hate to be that guy - but I seem to be getting an error when I follow the link. Have a look here (cant upload the screenshot to here for some reason...): https://ibb.co/yBnwSCJ Happening on Chrome: Version 81.0.4044.138 on a Macbook if you need some troubleshooting info.