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How do Netcraft calculate uptime?

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How do Netcraft calculate uptime? Software design forum discussing design principles and non-language specific algorithms. Get help with logic, algebraic, or relational concepts.

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Old April 22nd, 2003, 11:08 AM
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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 ( URL ) 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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Old April 22nd, 2003, 11:19 AM
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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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Old April 22nd, 2003, 11:57 AM
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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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Old April 22nd, 2003, 02:22 PM
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http://uptime.netcraft.com/up/accuracy.html

This will give you some clues.
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