The official KickassTorrents website (also known as Kickass Torrents, or just KAT) may be dead, but the war to keep its name alive rages on. The torrent site version of whack-a-mole is never-ending.
One apparently legitimate mirror was kickasstorrents.website, which came online courtesy of an isohunt member’s handiwork. It no longer works.
Another alternative was kat.am, referred to by many as the “official” reincarnation of the original KickassTorrents site. It too has died.
But the owner of kat.am has already launched two replacements: kickass.cd and kickass.mx. And, in contrast to other mirror sites, new torrents are being added frequently.
Another alternative is kickass.la. This site doesn’t appear to have any new torrents being uploaded, meaning it is a very basic mirror of the original.