It does not have a secondary server, like the other Free Public DNS Servers, and it is much more reliable. SmartViper DNS. It is IPv4 based best DNS servers, which is much more reliable and most common, found on the Internet today. The only disadvantage in this server is its inconsistent speed.
Windows/Mac/Linux: Last week Google announced a free DNS service designed to speed up your browsing, but just because Google wants to be fast doesn't actually mean they're the best option for you. Namebench finds the fastest DNS server for your connection.
Google Public DNS Aims to Speed Up Your Browsing
Google today launched a new, free DNS service—called Google Public DNS—aimed at making your web…
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After you download and fire up namebench, just click the Start Benchmark button to test out a handful of free public DNS services, from Google Public DNS to OpenDNS to UltraDNS. Once started, the test took about 12 minutes to complete using the default settings. When it's done, you'll be presented with a handful of handy charts displaying the results of the tests.
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(Click the image above for a closer look.)
You can see the results to my test in the screenshots above and below. From the looks of things, UltraDNS is the DNS that's going to do the most to speed up my connection. In fact, it claims UltraDNS will be 46% faster than Google Public DNS (the DNS server my computer was using when I ran the test)—so it looks like I may just be switching yet again.
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(Click the image above for a closer look.)
Namebench is a free, open-source download, works with Windows, Mac OS X, and Linux. If you give it a try, let's hear what DNS server scores highest for you in the comments.
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namebench [Google Code via Smarterware]