@JedClampett,

The MAC address is the easiest way to tell what devices are causing the alerts. Any other kind of identifier may change throughout the month, such as an IP address. MAC addresses are specific to every single electronic device. 

Most of the time, a specific type of device will be known to own a large pool of addresses that are similar in one aspect. As a result, there are tools online where you can type in your MAC address and it will return either the device type or manufacturer of the device. From here you can check the MAC address for those devices from their settings menu.

A few months ago, I had a user state that they had been placing every new device into an excel sheet with their MAC address and Static IP if given one. I started doing this and it has made my life so much easier, especially for situations like this. I would recommend starting to do the same as it would allow you to reference it when future reports come.