SinFP is a new approach to OS fingerprinting, which bypasses limitations that nmap has. More info: http://www.gomor.org/sinfp . SinFP has now 140 signatures. You can download it via CPAN, or via SourceForge: https://sourceforge.net/projects/sinfp Also, two benchmarks versus Nmap have been done: http://www.phocean.net/index.php/post/2006/12/17/SinFP http://www.computerdefense.org/?p=173 This new release has been tested under Solaris 8/SPARC, and Mac OS [...]