If you can, power stuff off and check if that web page is still available. Start with any Windows machines. It could be a virtual machine running inside of something else though.
I’d go around unplugging anything that might be connected to the network, like game consoles, smart TV, etc. It’s unlikely, but maybe something has copied that same screen to throw you off.
If you can, power stuff off and check if that web page is still available. Start with any Windows machines. It could be a virtual machine running inside of something else though.
I shut off my only windows machine and it is still there.
I’d go around unplugging anything that might be connected to the network, like game consoles, smart TV, etc. It’s unlikely, but maybe something has copied that same screen to throw you off.
It is probably going to come to this.
The mac address can also tell you the hardware vendor.