nmap

Network exploration and security auditing port scanner

brewmacoslinux

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Port scanning utility for large networks

nmapnpingndiff

Scan all ports on a target host$ nmap -p- 192.168.1.1

Detect OS and service versions on target$ nmap -A 192.168.1.1

Scan a subnet for active hosts$ nmap -sn 192.168.1.0/24