nmap

Command line open-source network and security scanning tool
Nmap ("Network Mapper") is a free and open source utility for network
exploration or security auditing. Many systems and network administrators
also find it useful for tasks such as network inventory, managing service
upgrade schedules, and monitoring host or service uptime.
.
This package contains the command-line only nmap, ncat, ndiff, and nping.
Most functions work without root privileges, while some (like OS fingerprinting)
do require them. If you use an option that does require root privileges
without using sudo, you will be notified that it requires them.