Pro Tracking - To search by Pro Number, enter our Pro Number and click Trace. - To trace by Interline Pro, enter the Interline Pro, the carrier SCAC code and click Trace. - To search for a SCAC code, enter the first letter of the SCAC code, click Trace and select the SCAC you would like to use. Please enter a Pro / Interline number PRO / Interline #   SCAC