“Monitor the IP adresses of your intranet” By Using Angry IP Scanner

This is a fabulous software......

Angry IP scanner is a very fast IP scanner for Windows. It can scan IPs in any range. Its binary file size is very small compared to other IP scanners. Angry IP scanner simply pings each IP address to check if it's alive, then optionally it can resolve hostname, scan ports, etc. This program is mostly useful for network administrators to monitor and manage their networks.