Ummm... Not exactly sure what you are looking for - can you elaborate?
If you are looking for a serial number to use to activate your software - you will need to purchase a seat of software - also 2009 is no longer a supported version with Autodesk.
If this helped solve your issue - remember to 'accept as solution' to help other find answers!
You can't think AutoCAD and run Revit.
Welcome to the Forums!
If you currently have a Serial Number for Revit Architecture 2009 but have misplaced it, you may request a report of all licenses registered to you at the Registration and Activation License Assistance Form. On the drop-down menu select "Report all of my licenses" and enter the pertinent information.
If you do not have a Serial Number of 2009, please be aware that only the current product (2013) is available for sale. You can purchase it through our Online Store or Locate a Reseller in your area to assist you.