Unknown name has been found in the networks

Hello,

I noticed a pop up with a device joining the network even if me or someone in my house didn’t join the network in that moment. I did a scan and an Unknown name has been found in the networks. I really don’t know what could it be and honestly I don’t know what joined the network, but it’s pretty strange I guess.

The device has joined 2 minutes after an URL malvertising got safely blocked. Is this a coincidence? It got blocked and I’m using a VPN, it looks like pretty strange it has something to do about it.

How can I find what is this thing?

Thank you very much

EDIT: I discovered that the device was my fritzbox in my living room, but that’s strange, nobody turned it on or off. Can it be an old device seen as a new connection? Strange. Now that I think about it it gives this “false inputs” with my devices every once in a while. Is the case closed and the malvertising thing just a coincidence?