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NMAP is an opensource network scanner software. There is a commandline version for Windows, but it is much better to use a linux PC with nmap installed, as you also get a GUI frontend for this plattform. most of todays distro’s already have nmap included. You can also use the knoppix Linux Live CD, as far as I know nmap is included. This CD is a fully functional Linux version which boots and works from this CD, so it isn’t necessary to install any software. You can download from http://www.knoppix.com
if you are trying to discover the ip addresses in use on your network “3Com Network Supervisor, 3Com Network Supervisor is a free download from 3Com that has an auto-discovery feature”
that is what i use. it is clunky but free