Is some.site.ru a subdomain of www.stire.ru?

Question

Domain Name System

Domustim have a site www.site.ru , then will the domain some.site.ru be a subdomain for this domain? It just confuses www, and in browsers when typing site.ru www is added automatically.

Answer 1

No, it's not.
www.site.ru is the most common subdomain of site.ru, and automatically adding www in some browsers if a version without www is not found is nothing more than a usability improvement.