(Note: if you're using a router, the IP displayed will be that of the router's WAN IP address, not your actual LAN IP address)
You can download the Windows 2000 version of WINIPCFG here:
http://www.microsoft.com/windows2000/techinfo/reskit/tools/existing/wntipcfg-o.asp
If the network connection icon is in the System tray, right click it, select Status, then go to the Support tab.
See this page for a small VB Script that will list all IP addresses in use on your machine.
Last, open a Command Prompt window and type IPCONFIG /ALL
