D2L - Finding a Course Number (UW-Madison)
There are several ways to find the course number, but for courses at UW-Madison, the easiest way is to find the following line in the course footer:
Every D2L course has course number to uniquely identify it.
If your course does not have this footer displayed, there are other ways to locate your course number. Please see Learn@UW - Finding a Course OU Number for more information.