I very much appreciate the feedback! When you say you tried to check a subdomain, do you mean a subdomain with hosts beneath it or do you just mean a hostname?

I very much appreciate the feedback! When you say you tried to check a subdomain, do you mean a subdomain with hosts beneath it or do you just mean a hostname? The code does a check that a name entered is a subdomain with an NS record. It is not intended for hostnames. (My target customer is a business owner who just wants to ensure his domain is configured correctly. [I think.]) Please feel free to contact me directly at mcculley@stackframe.com if you are interested in discussing further.