Nmap 5.61 Test 4 freeware download
... (both TCP & UDP), OS detection, version detection, ping sweeps, and more. See the documentation page. Powerful: Nmap has been used to scan huge networks of literally hundreds of thousands of machines. Portable: Most operating systems are supported, including Linux, Microsoft Windows, FreeBSD, OpenBSD, Solaris, IRIX, Mac OS X, HP-UX, ...
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