What do you mean when you write "Black Holed" ? Are you referring to
large sites online automatically blocking users, or your traffic being shut down by your provider?
Yes and no - The carrier is doing it - so no traffic can get through to the providers system (My node- even me). It's automated and can be initiated by any entity using the carriers infrastructure.
It's a simple Null Route - Someone is proberble oing a massive DDos...
Paul