No capture or anything, so you'll have to check them manually to see if they have subscription. This was tricky and I thought my proxies weren't working because I kept getting a 401 error on every try. Turns out that the 401 error was their way of saying that my credentials were incorrect. So, after correcting for that, it works fine.
Go to https://www.sling.com/signinto find out if their is an active subscription.
Enjoy