lucy24 - 2:13 am on Nov 7, 2012 (gmt 0)

Comcast Biz also includes all those employees who surf from their desks.

Ah ha. I don't think I've formally blocked any of their (many, many, many) ranges for that very reason: Just when you think it's completely useless, you get a bona fide human. And in my case it can be very hard to tell if they're goofing off or looking up something work-related ;)