is it possible to scan a router ip?

["sara fink" <sara.fink () gmail com>]

I tried to scan a router ip 10.168.x.x. I got an error. Can anyone
tell me how to do that?
nmap -sT O 10.168.x.x (changed to x for privacy reasons)

Starting Nmap 4.65 ( http://nmap.org ) at 2008-06-22 00:46 IDT
Failed to resolve given hostname/IP: O.  Note that you can't use
'/mask' AND '1-4,7,100-' style IP ranges

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