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Nmap 
Nmap is released under a custom license, which is based on (but not compatible with) GPLv2. The Nmap license allows free usage by end users, and we also offer a commercial license for companies that wish to redistribute Nmap technology with their products. See [Nmap Copyright and Licensing][https://nmap.org/book/man-legal.html] for full details.
The latest version of this software as well as binary installers for Windows, macOS, and Linux (RPM) are available from https://nmap.org/
Full documentation is also available on the Nmap.org website.
Questions and suggestions may be sent to the Nmap-dev mailing list.
Installing
Ideally, you should be able to just type:
./configure
make
make install
For far more in-depth compilation, installation, and removal notes, read the Nmap Install Guide on Nmap.org.
Using Nmap
Nmap has a lot of features, but getting started is as easy as running nmap scanme.nmap.org. Running nmap without any parameters will give a helpful
list of the most common options, which are discussed in depth in the man
page. Users who prefer a graphical interface
can use the included Zenmap front-end.
Contributing
Information about filing bug reports and contributing to the Nmap project can be found in the HACKING and CONTRIBUTING.md files.