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Thanks Vinod. I just ran that and reset the network cache following the instructions with disconnected routers. All other computer devices (including other computers that are greyed out because they are not currently connected) allow me to mark them as friend or intruder.
The 255.255.255.255 device that showed up in the past week does not allow me to do anything but hide it (whatever it is, it is not currently connected as it is greyed out). I don't know whether it is something that has tried to gain access to my network (I cannot find any connection in the logs), how to block its access, or how to delete it from my network map.