nmap Discover others question

Hi All,

   Using NMap from the command line, I would like to
discover what all is attached to the Ethernet.  This
run string seems to fulfill the request:

        nmap -O -v 192.168.255.0/24

Question: what about devices that do not use this
network?  Is this not a issue, as they couldn't communicate
anyway?  If they are connected though a "route" command,
would they not show up anyway?

Many thanks,
-T


-- 
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Computers are like air conditioners.
They malfunction when you open windows
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