Desarrollo Linux y software libre

Si se desea tener diversos dominios en una misma cuenta de hosting, es necesario a parte de tener configuradas las DNS adecuadamente, tener en la raíz del hosting si utiliza Apache la siguiente configuración en el fichero «.htaccess» 

 # .htaccess main domain to subdirectory redirect
        # Copy and paste the following code into the .htaccess file
        # in the public_html folder of your hosting account
        # make the changes to the file according to the instructions.
        # Do not change this line.
        RewriteEngine on

   # INICIO DOMINIO1
        # Change example.com to be your main domain.
        RewriteCond %{HTTP_HOST} ^(www.)?example.com$
        # Change 'subdirectory' to be the directory you will use for your main domain.
        RewriteCond %{REQUEST_URI} !^/subdirectory/
        # Don't change these line.
        RewriteCond %{REQUEST_FILENAME} !-f
        RewriteCond %{REQUEST_FILENAME} !-d
        # Change 'subdirectory' to be the directory you will use for your main domain.
        RewriteRule ^(.*)$ /subdirectory/$1
        # Change example.com to be your main domain again.
        # Change 'subdirectory' to be the directory you will use for your main domain
        # followed by / then the main file for your site, index.php, index.html, etc.
        RewriteCond %{HTTP_HOST} ^(www.)?example.com$
        RewriteRule ^(/)?$ subdirectory/index.html [L]
    #FIN DOMINIO 1
    #INICIO DOMINIO 2
      (...)

Reemplazando «example.com» por el dominio en cuestión y «subdirectory» por el subdirectorio que lo albergará. Repetir el bloque de directivas por cada dominio.

Fuente: https://my.hostmonster.com/cgi/help/347