From the Blackboard Courses List View
When you first sign into Blackboard on the Courses list page you will find the full CRN above the title of the course.
Inside a Classic Course
Your Course Record Number (CRN) and course ID information are easy to find inside your course web site. Just click FILES under the CONTROL PANEL heading.
Inside an Ultra Course
At the top of the course, you will see the full CRN listed just above the course name.