Since Google released its Public DNS, I was curious about how it would really perform. Thus, I have looked around and I have found a script on the internet that I ran at home, here are the results:
+------------------+--------+--------+--------+ | Domain | My ISP | Google | OpenDNS| +------------------+--------+--------+--------+ | lifehacker.com | 17 ms | 68 ms | 68 ms | +------------------+--------+--------+--------+ | facebook.com | 18 ms | 69 ms | 68 ms | +------------------+--------+--------+--------+ | manu-j.com | 19 ms | 79 ms | 70 ms | +------------------+--------+--------+--------+ | reddit.com | 58 ms | 88 ms | 66 ms | +------------------+--------+--------+--------+ | tb4.fr | 16 ms | 64 ms | 67 ms | +------------------+--------+--------+--------+ | bbc.co.uk | 55 ms | 65 ms | 67 ms | +------------------+--------+--------+--------+ | lemonde.fr | 58 ms | 63 ms | 78 ms | +------------------+--------+--------+--------+ | dailymotion.com | 58 ms | 66 ms | 68 ms | +------------------+--------+--------+--------+ | faz.de | 57 ms | 65 ms | 99 ms | +------------------+--------+--------+--------+ | gmx.de | 56 ms | 62 ms | 68 ms | +------------------+--------+--------+--------+
Google Public DNS and OpenDNS performed quite similarly. However, my own ISP is still quicker to respond, a possible answer is that Google DNS in Europe are located in Frankfurt, Germany.
N.B.: these tests were performed on a wireless link under Mac OS X Leopard in Toulouse, France. If you want to run the script on a Mac, you should change the first line of the script to #!/bin/bash
Update 2009.12.10:
- Another article about how to increase DNS speed by caching the information on Linux.
- (French) et pour les lecteurs français de ce blog, un autre article très intéressant sur une analyse plus en profondeur de l’intérêt de Google DNS.