Subdomains and DNS


I have enabled subdomains on my server, i create a subdomain and try to browse to it, but i can only browse to it if i put www. at the beginning of it. If i do not have the www. then it will not find it.

How can i make it so i can just type in

I was also wondering if it is possible to stop a admin and webmin entry being added to the DNS every time i create a subdomain. As the moment if i create a subdomain called moo, it will add these entries, i want to get rid of the last two.