How to get a list of IPs from all PCs connected to LAN (VB Net)

I have to control number of computers (up to 20) which all run my custom software.
So I need to know IP addresses of all connected computers.
How can I get list of all addresses in local network?

WMI Scripting is one option. First get Scriptomatic2 to see how they query all computers, then look at this:

http://www.microsoft.com/technet/scr...7/hey0627.mspx

This great project would also be quite useful :
http://www.codeguru.com/forum/showth...post&p=1556461