NBT Host Monitor is a network ping monitor that can monitor dozens or thousands of Windows computer across the network. You can enter one or more IP ranges and the program will retrieve host information along with the MAC address, work group, NIC vendor and other details. If a host becomes unavailable, the program can notify you by email, pop-up dialog, net message, file execution or syslog message. Other features include customizable error messages and logging.

The license of this software is Free Trial Software, the price is $29.95, you can free download and get a free trial.