@marcusob 

There might be no place to show you what is the device connected to the LAN4 ports, but you can check if you can find it out like below:

Option 1: Go to Advanced > Status, then look for Wired Clients, there will show you the IP address and MAC of that specific device that is connected to the LAN port. Then you can verify what are they by comparing with the devices' MAC and IP addresses on the devices themselves. For example, for a Windows computer, you can verify its MAC and IP by going to Control Panel > Network and Internet > Network and Sharing Center > Change adapter settings > right-click on Ethernet > Status > Details.

Option 2: Go to Advanced > Network > DHCP server > DHCP Client List. But this may only show you all the client devices that are using an automatic IP address, it will not show you those with a static IP address.

Option 3: Go to Advanced > Security > IP & MAC Binding, there you will find a ARP List, you can also verify if there are those devices that connect to the router LAN with the MAC addresses.