It is a free open source substitute for network exploration or security auditing. NMap was designed to rapidly scan large networks, although it works fine against single hosts. Network Mapper 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 they are running, what type of packet filters/firewal ls are in use, and dozens of other characteristics . Nmap runs on most types of computers and both console and graphical versions are available. Nmap is free and open source.
Can be used by beginners (-sT) or by pros alike (–packet_trace) . A very versatile tool, once you fully understand the results.
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