We produce the free and open source Nmap Security Scanner, which will be celebrating its 10th anniversary this year. Briefly, Nmap is a utility for network exploration, administration, and security auditing. It uses IP packets in novel ways to determine which hosts are available online (host discovery), which TCP/UDP ports are open (port scanning), and what applications and services are listening on each port (version detection). It can also identify remote host OS and device types via TCP/IP fingerprinting. To learn more, check out Nmap.Org.