I recently discovered something a little concerning I guess. There seems to be a device/client on my WLAN that I don't know and cannot identify as it says it is called 'localhost' (and sometimes it says 'unknown'). It has the IP 192.168.0.10 which is one of the most common to my knowledge. None of my devices use or used that IP. I first thought that 'localhost' could be some kind of 'artefact' because I sometimes run node.js/XAMPP locally (altough I am aware that localhost runs on 127.0.0.1). I now am certain that it is none of these which is why I came here for help! I hope someone had a similar issue/knows what this could mean.
Thank you so much for taking the time to answer my question!