Network scanning tools are a bit of a grey area. For those of us who need to keep systems secure, they are valuable tools. But for those who are unaware of their existence, they are a means for a would be attacker to scan your network in search of vulnerabilities.
The eEye Digital Security website has a number of free utilities which may be of interest, in particular the nmapNT and LibnetNT utilities, which are Win32 ports of the similarly named Unix tools.

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More free networking tools can be found here:
Network Management Tools
Enjoy!