Nmap is an abbreviation of 'Network Mapper', as is a very well known free open source hackers tool. Nmap is used for network discovery and security auditing. Many system admins use nmap for network inventory, open ports, managing service upgrade schedules, and monitoring host or service uptime. The tool uses raw IP packets in creative ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions and possible patches) and what type and version of packet filters/ firewalls are being used by the target.
Nmap is a very popular hacking tool that was originally created to act as a method of being able to scan large networks, but it works absolutely fine o single hosts (targets). Nmap works on all major computer operating systems, and official binary packages are available for Linux, Windows, and Mac OS X. Nmap was traditionally a command-line tool, but there is a GUI available called 'Zenmap'.
Using NMap
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