Who is that device

[Jay_V]

When looking at my device list, I see several devices with no real identification but IP address assigned. Is there a way to identify exactly what is connected to that IP address?

[CrimpOn]

"exactly?"  No. However, the MAC address can be used to determine who manufactured the ethernet card.  There are dozens of web sites that do this.  Here is one: https://aruljohn.com/mac.pl 

Another solution is to turn on Access Control, block one of the MAC addresses and see what stops working.