How to Set wildcard DNS

Edit the httpd.conf and add the line in virtual host of domain.

ServerAlias *.domain.com www.*.domain.com

restart httpd/apache service.

Now edit the DNS file or db file of domain and add the line as

*.domain.com. 14400 IN A IP of server
www.*.domain.com. 14400 IN A IP of server

restart named service

Enjoy

Ninad S