Detecting if ISPs are blocking torrent download

There are 2 software's you can run to attempt discovery of ISP bittorrent throttling.

Switzerland Network Testing Tool

Glasnost: Test if your ISP is shaping your traffic

More reading

you can port blocking from your isp with this site:

What is my ip - Port Scanner

but you can randomize port of torrent client that cause bypass specific port blocking from isp.