I have a website that I believe is not having issues. I works when I use it, and it works for 20+ other people that I have asked to test it. However, we have had other people complain that it is not working and that it just comes up with a Server - Host not found (or something like that).
I believe the domain name is not resolving when routed from some parts of the country. (I don't know how that works so that might have been a silly statement)
My nameservers are...
...but I do not know how to check if there is a problem or who to contact to get help. How should I proceed?
Your advice is greatly appreciated.