IP address tracking

There are numerous vendors for sniffers. SolarWinds is well known:
http://www.solarwinds.net/

Try out some free apps to determine your needs and then go commercial if you need to. Check here:

http://www.freewarehome.com/Internet/Networking/Network_Monitoring_t.html

Cheers.

RW

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 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

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