Setting subdomain in ubuntu in LAN

Question

I have created some domain in /etc/hosts files

192.168.0.11    domain-11.com
192.168.0.12    domain-12.com
192.168.0.13    domian-13.com

and also created a files in /etc/apache2/site-avalaiable/ in respective machine like in machine 192.168.0.11 added a file domain-11.com my /etc/apache2/sites-available/domain-11.com files contains

<VirtualHost *:80>
    ServerName domain-11.com
    ServerAlias *.domain-11.com    
    DocumentRoot /home/user/public_html/domain/

    <Directory /home/user/public_html/domain/>
        Options Indexes FollowSymLinks MultiViews +Includes
        AllowOverride None
        Order allow,deny
        allow from all
    </Directory>
</VirtualHost>

I'm not able to access www.domain-11.com or any other subdomain.domain-11.com i want a wildcard subdomain here.