Who are the worst registrars? Martin Heller’s got them, according to KnujOn’s list anyway. “Not surprisingly, the worst three are in China, Heller writes in Wall of shame: 10 worst domain registrars. All of which leads to the question: What would it take to either shut down or at least clean these guys up?Part 1: 20 registrars control 20 percent of illicit domains. Software Development