What changes should be made to the NS records to give the user a fictitious 3rd level domain?

Question

Domain Name System

The task is to programmatically process all urls of the form aaa.domain.ru bbb.domain.ru, etc., when accessing the domain.ru domain, but without physically creating these domains. With software t.z. everything is clear, but what exactly and how to set up on hosting?

Answer 1

https://en.wikipedia.org/wiki/Wildcard_DNS_record