get net name after place and route, ISE

[Matthew E Rosenthal]

Hi all,
I am using ISE 6.2 and after place and route static timing analysis I see
a net in my critical path that looks like it doesn't belong.
All i have for the net name is a bit of hiearchy and a N21408.
Is there a way to map back from this N21408 to see where this is generated
in the hdl code?

thanks

Matt