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Nmap Network Scanning

Chapter 16. Ndiff Reference Guide


ndiff — Utility to compare the results of Nmap scans


ndiff [ <options> ] { <a.xml> } { <b.xml> }


Ndiff is a tool to aid in the comparison of Nmap scans. It takes two Nmap XML output files and prints the differences between them. The differences observed are:

  • Host states (e.g. up to down)

  • Port states (e.g. open to closed)

  • Service versions (from -sV)

  • OS matches (from -O)

  • Script output

Ndiff, like the standard diff utility, compares two scans at a time.

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