Version Detection [-sV]

Version Detection collects information about the specific service running on an open port, including the product name and version number. This information can be critical in determining an entry point for an attack. The -sV option enables version detection, and the -A option enables both OS fingerprinting and version detection, as well as any other advanced features which may be added in future releases.

Version detection is based on a complex series of probes, detailed in the Version Detection paper at http://www.insecure.org/nmap/vscan/