How can I identify the IP address of a device on my LAN?

If I attach a device to my LAN but have no idea of its IP address (ie it may not even be communicating), is it possible to identify its static address?  Or will it only respond (to something like nmap) if the route of the transmitting device device is correct?
For instance, my PC is 192.168.0.4 and its default route is 192.168.0.1.  If I attach another router that has an address of 192.168.1.254, how can I determine that its physically connected?   Using nmap -PR 192.168.0.0/16 for host discovery doesn't reveal its there unless I change the default route to (something like) 192.168.1.1

adee wrote:Ok, so:
...Those are not on the same subnet dude!
I realise that, but they are sat at each end of a 1m ethernet cable and I want to know if its possible to recognise there is a device on the physical network even though its on a different subnet.

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