Related to this question: What’s the point in having “www” in a URL?
How can I do a “www” redirection form a DNS record level? I don’t want to tweak apache or IIS to achieve this.
If your web server is configured in meaningful way, you can just add two records that point to same server. Usually it's not important to have specific address in user's address bar (what is the difference if user sees
As already answered, you can't redirect client on DNS level. In web server, you don't have to modify web server configuration, if both virtual hosts (with and without
www) point to place where you can put your own scripts. For example, in PHP you can just write
to redirect visitors to example.com (without www).