How to set up subdomains?

Question

htaccess

Hello! I'm working on a bulletin board. When you select a city, the page opens on a subdomain, for example, msk.site.ru. But when opened, the browser gives an error: Cannot access the site Could not find the IP address of the server. I understand you need some setting in htaccess?

Answer 1

First you need to add subdomains or wildcard (asterisk) to DNS. tyts
Then set up a webserver.
Therefore, htaccess will already reach (but this is not accurate).

Answer 2

You misunderstand.
First you need to add A-records to DNS for each subdomain or wildcard-domain *.site.ru.