I'm trying to understand how to publish the DNS of a subdomain. For example, if I have mydomain.com which points to IP 444.444.33.344. I added an A Record to this domain with host = "meetings" and IP 222.222.32.332. The domain resolves to mydomain.com @ 444.444.33.344 and the subdomain, meetings.mydomain.com points to (resolves to) 222.222.32.332.

However, if I use mxlookup to check the subdomain meetings.mydomain.com, the results state that the DNS record is not found. I'm trying to understand how to have the DNS record found and show that it resolves to 222.222.32.332.

In the end, I'm trying to use Let's Encrypt for a SSL certificate on the subdomain which points to a bigbluebutton server. I know this is a very newbie questions so may just a point in the right direction to research would help.