In my experience, I know very few actors who do not want their agent's and manager's contact information to be readily available. There are several reasons including:
1. Most actors want it to be easy for people to offer them work.
2. Most actors prefer for this information to be readily available because it decreases the number of people who try to contact them in creepy ways.
3. It's one way of justifying the extraordinary percentage of their pay that agents and managers scoop off.
Regarding IMDBPro, there is a free trial (a week? a month?) that can solve this problem at least once. (And they are quite accurate in the information they have on the site.)