A lot of shared providers will not allow trackers legal or not, you might find it hard finding one unless they are off-shore or don't care about the services they are offering :-/
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a torrent tracker might be a bit too much for a shared hosting plan, as some torrent clients "hit" the tracker too often, that might overload the web servers in some cases , I do recommend going with a VPS or entry level dedicated server that should do the job for you.