I refrained from calling them by name and would like to keep it that way, but I can say that it's one of the largest / most popular German hosting companies. (It's probably easy to figure it out via a whois lookup, actually.)

Over the course of a couple of years, their service was good and I didn't run into any major problems besides this one. The cutoff was a real bummer (especially with a concept like Impetus), but I have to give them a little credit: seconds after my angry call, the site went back up.

It was not bluehost.