There are several DNS servers are there for free use such as OpenDNS, Google Public DNS, Ultra DNS, etc, but which one is fastest and secure one?
The freeware utility Namebench can help you to find out fastest and more secure DNS Server. This utility carries out benchmark tests on multiple DNS servers and recommends the best one for you.
Namebench is a free and portable utility and runs on Mac OS X, Windows, and UNIX systems. Download it : http://code.google.com/p/namebench/