IsoHunt was a BitTorrent index owned by isoHunt Inc. with over 1.7 million torrents in its database and 20 million peers from indexed torrents. With 7.4 million unique visitors as of May 2006, isoHunt was one of the most popular BitTorrent search engines. Thousands of torrents were added to and deleted from it every day. Users of isoHunt perform over 40 million unique searches per month. On October 19, 2008, isoHunt passed the 1 petabyte mark for torrents indexed globally. The site was the third most popular BitTorrent site as of 2008. According to isoHunt, the total amount of shared content was more than 14.11 petabytes as of June 13, 2012.
For years isoHunt's founder had been in legal battles with conglomerates of IP rights holders over allegations of copyright infringing activity. A settlement with MPAA was reached in 2013, that stipulated $110 million reimbursement for damages and the site's closure that followed on October 21, 2013.