A total of 9 sites are hosted on 50.17.221.6.
Here are the first 5 as they would appear when searched for:
myprgenie.com/user/add_contact
(null)
myprgenie.com/user/activate
(null)
myprgenie.com/user/fan_home
(null)
myprgenie.com/user/index
(null)
myprgenie.com/user/tab_newsroom
(null)
...and the list of the remaining 4:
myprgenie.com/user/profile
myprgenie.com/user/signin
myprgenie.com/user/followed_companies