Subdomain aliases?

Hello
I have a debian server with webmin.
I would like that when someone goes to blah.domain.com he access to domain.com

Someone told me to do a bind * via a A record
How to do this?

I have tried
* IN CNAME domain.com.

But it don't works, perhaps does it require a time to make the update?

Thank you for your help!

 

 

 

 

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