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DotNmap is a graphical front-end to the Nmap (Network Mapper) network discovery tool. User selections and inputs automatically create valid Nmap commands, making it easy to use Nmap effectively without knowing the intricacies of the command line. Advanced users can directly modify generated commands or enter commands in command line mode.

Nmap is a powerful, popular and acclaimed open source utility for network exploration or security auditing. It was designed to rapidly scan large networks, although it works fine against single hosts.

Nmap uses raw IP packets in novel 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) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics.