I don't know for sure, but I can tell you that this isn't a company, but a university, and based on a press release from a couple years ago, I'm pretty sure the

I don't know for sure, but I can tell you that this isn't a company, but a university, and based on a press release from a couple years ago, I'm pretty sure they use OnSystem Defender. This might not be their fault, though; it might be that the school itself blocked all .cc domains using their own firewall rules.