-supports many techniques for mapping out networks filled with IP filters,firewalls, routers, and other obstacles,
-used to scan huge networks of hundreds of thousands of machines,supports most operating systems, including Linux, Microsoft Windows, FreeBSD, OpenBSD, Solaris, IRIX, Mac OS X, HP-UX,easy to start out,
-available for free, comes with full source code that you may modify,comprehensive and up-to-date man pages & tutorials;
-has won numerous awards
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