CriminallyStupid

Is there even anything that hooks into this port?

Not at all my AMA but you might find http://highscalability.com/blog/2015/11/9/a-360-degree-view-of-the-entire-netflix-stack.html interesting. Might be a bit dated though surely OP will comment :)

The VPN/proxy crack down was a bit rough, but you're doing a good job and it has killed a lot of the bigger commercial operations. Roughly what percentage of users might access content libraries that were outside their normal home area/billing address?