Nmap is a free and open-source network scanner used to discover hosts and services on a computer network by sending packets and analyzing the responses.
Use Cases
Network discovery
Port scanning
Service detection
OS fingerprinting
Common Commands
nmap -sV target
Service version detection
nmap -A target
Aggressive scan with OS detection
Alternatives
masscanzmaprustscan
My Experience
I regularly use Nmap in my security work, particularly for
Network discovery.