Check if an IP address is up, and guess the remote host's operating system

Network exploration tool and security / port scanner.
Some features only activate when Nmap is run with root privileges.
More information: <https://nmap.org>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

nmap -O {{ip_or_hostname}}

click the source code to copy install nmap on any operating system with command-not-found.com