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Nmap (Network Mapper) is a free and open-source (license) utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks like network inventory, managing services upgrade schedules, and monitoring host or service uptime. Nmap runs on all major computer OS and officially binary packages are available for Linux, Windows, and Mac OS. It is the most powerful tool to scan the ports of the target.com and Google.com ports.