Microsoft SQL Server Fingerprint Tool
This is a tool that performs version fingerprinting on Microsoft SQL Server 2000, 2005 and 2008, using well known techniques based on several public tools that identifies the SQL Version.
It is available from here
The author blogs is available from here
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C:\>mssqlfp-BETA4.exe [-d <ADDRESS>] [<OPTIONS>]
-d ADDRESS Define destination IP address
-D Display detailed module information.
-T TIMEOUT Define timeout for tentative (default is 5).
-h Display the help message.