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Nmap (Network Mapper) is a network security scanner.


General features:

  • Host discovery
  • Port scanning (enumerating open/closed/filtered ports on one or more target hosts)
  • Service detection (determining service types and version numbers)
  • OS detection

Other features:

  • IP protocol scan
  • Uptime detection (using TCP timestamps
  • Traceroute
  • DNS resolution
  • Idle scan (using "zombies")
  • FTP bounce scan (using proxy FTP connections)
  • etc

Typical uses

  • Identifying open ports on a compromised host
  • Auditing the security of a network, by identifying unexpected computers