Opentracker is a free (licensed as beerware) BitTorrent peer tracker software (a special kind of HTTP or UDP server software) that is designed to be fast and to have a low consumption of system resources.

Because there have already been cases of people being accused of copyright violation by the fact that their IP address was listed on a BitTorrent tracker,[2] opentracker may mix in random IP address numbers[3][4] for the purpose of plausible deniability.

It runs completely in RAM, accounting for much of its speed advantage over other tracker software.

The world's largest tracker at The Pirate Bay switched from their selfmade software Hypercube to opentracker in the end of 2007.

[7] Popular public torrent trackers opentrackr[8][9] and coppersurfer[4] are known to use opentracker.