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How can I set my DNS server addresses to the closest OpenDNS servers?

Just use 208.67.222.222 and 208.67.220.220.

Thanks to anycast, those numbers will direct you to the closest of our five locations automatically. And, by using those numbers, if we take a location offline for maintenance, you will be automatically re-directed to the next closest.

Here's a definition, if you want more details on anycast: http://en.wikipedia.org/wiki/Anycast