Last week, DNS provider Dyn was unavailable for a good part of Friday. I blogged late that day about how a computer using OpenDNS was able to access a particular website, while another computer, a block away and using the same ISP, could not. The good computer was using OpenDNS while the problematic one was using DNS servers from our ISP.
I asked OpenDNS about this and the explanation is both interesting and simple.
Starting at the very beginning, computers on the Internet are identified with numbers, called IP addresses. The most common type of IP address is a 32 bit binary number, typically written as four decimal numbers separated by periods (i.e. 1.2.3.4). You can get to Google based on its IP address with
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Why OpenDNS succeeded where ISP DNS failed when Dyn was unavailable
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