How do I actually FIND connected devices on my WiFI?

[DRKrueger22]

I'm learning to use my router and I'm on the ATTCHED DEVICES page. There are 3 devices I don't recognize. 2 says n/a and 1 is a long string. All 3 have a IP on my network. How can I physically find these devices?

[plemans]

have you compared the IP addresses to the devices on your networks IP address?