Find IP address of poe devices attached to my computer via ethernet

I'm currently trying to setup zoneminder on my computer that has Ubuntu as a host OS. Before I do all that, I want to know if the poe CCTV camera I purchased works, a Reolink RLC410-5MP There are multiple ways to achieve this but the simplest one I found was to use the rstp URL in VLC After searching the correct format for the URL, this is what I found > Main Stream: rtsp://admin:password@ip_address:554//h264Preview_01_main What I need now is the IP address of the CCTV, which is connected directly to my laptop via an Ethernet cable and is being powered by a power supply I'm not 100% sure how to find the IP address, one way I found is using nmap -sn 192.168.0.0/24 However the above shows 8 devices connected and I'm puzzled as I should be only expecting one/two devices(the CCTV and maybe the router?) What's the best way to find the IP address of a poe device physically attached to a laptop via an ethernet cable?