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    How do Netcraft calculate uptime?


    Maybe the wrong forum for this, but anyway:

    Just wondered if anyone here knows how netcraft ( http://www.netcraft.com ) calculates the uptime of webservers?

    It's not something that's reported from webserver thru the http headers so I'm really curious how they do it
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    It's been a long time but according to them they ping the servers or something (they call samples). Search.
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    No, they don't ping the server, that Im sure of

    I've been searching on google and didn't find anything on this.
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    http://uptime.netcraft.com/up/accuracy.html

    This will give you some clues.
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