How can I automatically create a unique 3rd level domain for each user?

Question

Domain Name System

Hello!
The essence of the question is how can you automatically create a unique 3rd level domain for each user?
A good example like megaplan.ru, for example, I register as user1 and they will give me a direct link user1.megaplan.ru
That's actually the question of how to organize this automatically and what resources are needed for this?

Answer 1

1. make an A record with * for this domain
2. specify to the web server, via *.domain.name, that it accepts all subdomains of
everything