Google’s Public DNS Resolution Service

Google, within the past several days, announced that they are now offering a FREE, global Domain Name System (DNS) resolution service, that you can use as an alternative to your current DNS provider (which is usually through your Internet Service Provider).

The DNS protocol is an important part of the web’s infrastructure, serving as the Internet’s phone book: every time you visit a website, your computer performs a DNS lookup. Complex pages often require multiple DNS lookups before they start loading, so your computer may be performing hundreds of lookups a day.

As web pages become more complex, referencing resources from numerous domains, DNS lookups can become a significant bottleneck in the browsing experience. Whenever a client needs to query a DNS resolver over the network, the latency introduced can be significant, depending on the proximity and number of nameservers the resolver has to query (more than 2 is rare, but it can happen). As an example, the following screen shot shows the timings reported by the Page Speed web performance measurement tool. Each bar represents a resource referenced from the page; the black segments indicate DNS lookups. In this page, 13 lookups are made in the first 11 seconds in which the page is loaded. Although several of the lookups are done in parallel, the screen shot shows that 5 serial lookup times are required, accounting for several seconds of the total 11 seconds page load time.

You can learn more about Google’s Public DNS resolution service and how to configure your PC to use the service [ HERE ].  The official announcment page can be found [ HERE ] . I have not tried the service yet, due I currently use (and recommend) the popular OpenDNS resolution service on my PC’s. I would be interested in hearing about any comparative analysis between the (2)-two services and your thoughts about Google managing your DNS.

How is OpenDNS responding to this new competitor?  Click on the graphic below to see David Ulevitch’s (founder of OpenDNS) response to the release of Google’s Free DNS resolution service.


I also encourage to visit the TTC Shelbyville blog to read about Google’s DNS resolution service and their recommendations [ HERE ]


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10 thoughts on “Google’s Public DNS Resolution Service

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  1. Rick,
    I just now noticed the new advisory posted at the top of your sidebar, and I just wanted to say that I (for one) will miss your daily posting. But! I surely understand, and want to offer my housewarming wishes, and a speedy return to What’s On My PC?.

    You and your site are real “undiscovered gems of the Internet”, and I appreciate all you do here.


    1. TechPaul,

      Yes, the blog will probably be dormant for awhile once reality of moving sets in. I’m planning (hopefully) by the end of this week all that will be left in the house, (for about a week ’til settlement), will be the cat, the fish, my wife, my DSL modem/router, and my netbook. Really, what else does a Geek need?



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