Torrent websites come in two shapes on the Internet. Public sites like The Piratebay can be accessed by anyone while private torrent sites can only be accessed by those with user accounts. What makes this difficulty is that most private torrent sites are closed for registration most of the time and only open up registrations frequently.
Trackerchecker is basically a website that lists hundreds of torrent sites on one page. The site regularly checks all websites and lists the registration status of each on the same site. Sites with a green icon are open for registration while red ones are closed.
There are also crossed out red icons which means that the site is not available at that time at all and blue icons which indicate timeouts. It basically boils down to checking the websites with green icons as all other sites are either down or closed for registration.
Trackerchecker will also list the time it last checked each website. If you create an account at the site you can select specific sites to track which makes things a bit easier.
Update: Tracker Checker has been updated recently. The new version offers a large list of open, closed and offline trackers. Interested users find hundreds of Bittorrent trackers there, along with their web addresses, the last time they were verified by the Tracker Checker service and a history view which lists the service's status history.
The tracker list is sorted alphabetically. Use your browser's search to find a specific tracker name or url in the list. There is no option to sort the trackers based on their status.
Another issue is that Trackerchecker seems to only test tracker availability sporadically. The last checked data on the site currently was ten days ago.
Update: The Tracker Checker website is no longer available on the Internet. An alternative that is still up and working is BtracsAdvertisement
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