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After OpenDNS, it's Google turn to launch its own public DNS service. In this tutorial, we will show you how to test the speed (response time) of these nameserver addresses to decide which one to use. Therefore, we will send a query using the dig command followed by the nameserver address.


 Here is an example that allows to test OpenDNS:

    dig @208.67.222.222 spotht.com | grep "time"

Here is What I obtained:
   
    ;; Query time: 511 msec


Note: OpenDNS uses the following nameserver addresses:

    208.67.222.222

    208.67.220.220


To test Google Public DNS, run this command:

    dig @8.8.8.8 spotht.com | grep "time"

Here is what I obtained:

    ;; Query time: 226 msec

Note: Google uses the following nameserver addresses:

    8.8.8.8
    8.8.4.4


If you use other nameserver addresses such as that of your ISP, or any other service, you can use the dig command to test their speed and compare them so that you decide which one to use.

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