I know one can view the IP addresses by user when they log in to Populi. (account & settings > reporting > logins).
It would be nice if the filter could include by course. Here's why - A school is California posted this issue in a discussion board that I'm a part of - "One of the challenges we all face is verifying that students are actually the authors of the work they submit in courses via the LMS. Recently, we discovered irregular patterns when analyzing IP addresses that raised concerns in a few instances about whether students had shared their login credentials with an individual who was submitting work on their behalf. In some cases, students admitted having done so. But in other cases, they adamantly denied such behavior."
Currently, there does not appear to be an easy way to pull data to know who is logging into specific courses (by IP address).