We recently needed to add a PTR record. So I called our DNS hosting company. They said I would need to call our ISP. I called. Then our ISP did it very quickly.
I did not have the impression that our ISP had contacted our DNS hosting company for this. So I am very curious how our ISP added a PTR record in our DNS without knowing the login credential to our DNS hosting? Or in other words, does an ISP have to login the DNS hosting in order to add a PTR record? If not, how can they do it?