Updating .htaccess rewrite conditions

Question

I'll like to update the following rewrite condition to only allow one particular subdomain.

RewriteCond %{HTTP_HOST} !^domain.com$ [NC]

At the moment, it matches all subdomains, but I'd like to allow just one - admin.domain.com. How would I do this?

Thanks for any help in advance.

Answer 1

It should work:

RewriteCond %{HTTP_HOST} admin.domain.com [NC]
RewriteRule //whatever

Am I wrong?