Go to www.nsiregistry.com and look on the right side. You can choose 'nameserver' instead of just domain name to get information on a registered NS. It can be a bit slow, but it works just fine.

Adam Hardy is a former assistant editor at Forbes Advisor, where he covered small business and tech. Previously, he was a staff writer at The Penny Hoarder, specializing in the gig economy and ...

shows me that of the three nameservers listed, one of them one of them is "bad". It is either a nameserver we no longer have, or perhaps we never had. What I don't understand is what to do about it.