You should be in priveleged mode on most IOS versions to enter show mac (some later versions the command is show mac-address-table).
You can limit the output to what you're looking for using the pipe extensions,
e.g.
# show mac-address-table | include 0020.03de.4b5f
Cheers,
Phil.
If everything is coming your way then you're in the wrong lane.
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