A website example.com has one subdomain a.example.com. The point here is I want to redirect all existing and non existing subdomain (ex- b.example.com) to example.com without changing URL(URL MASK). To explain it more further, when a user enters b.example.com he must see example.com on his screen but URL must not change from b.example.com --> example.com. I think its possible from .htaccess file but I failed to achieve it.
Do I need to configure virtual host. Since I only have access to .htacces, I wish I can get it done