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Ethical Hacking Academy · Lesson

Service and OS Detection

Fingerprinting.

From Open Ports to Targets

Knowing a port is open is not enough. You need to know what software is listening and its version, because exploits target specific versions.

Nmap's service detection and OS fingerprinting turn a list of open ports into actionable intelligence.

Service Version Detection

The -sV flag probes open ports and matches responses against Nmap's database to identify the service and version, for example 'OpenSSH 8.2p1' or 'Apache httpd 2.4.41'.

nmap -sV 192.168.1.10
# 22/tcp open ssh OpenSSH 8.2p1 Ubuntu

All lessons in this course

  1. Host Discovery
  2. Port Scanning Techniques
  3. Service and OS Detection
  4. The Nmap Scripting Engine
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