Check out the MACs in your network with this tool. WoL-ARP-Mon can scan a local network for active MAC addresses by sending ARP-Requests out. The MAC Addresses the program will collect are stored and so its easy to send WoL Datagrams out for the PCs in the list. The .net RTE needs to be installed.

The license of this software is Free, you can free download and free use this network monitoring software.