Recently I was looking for the fastest responding DNS servers to speed up my Internet experience. I came across a great tool called namebench – an open-source DNS benchmark utility. From their website:
It hunts down the fastest DNS servers available for your computer to use. namebench runs a fair and thorough benchmark using your web browser history, tcpdump output, or standardized datasets in order to provide an individualized recommendation. namebench is completely free and does not modify your system in any way. This project began as a 20% project at Google.
Download from free from their website - https://code.google.com/p/namebench/