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2- Programming language in use: PHP: 15.3% ASP.net: 14.4% Java: 1.6%

How do they even tell, given that sites can avoid having .php/.asp/.jsp in their URLs if they want to?

We checked the extensions, the "Server:" option in the header and the "X-Powered-by" option. We tried our best:)

So were the other 68.7% all unknown?

Well, given that those stats add up to a lot less than 100%, one assumes that they cannot in most cases.