Naming and Shaming ‘Bad’ ISPs
I asked or simply polled some of the most vigilant sources of this information for their recent data, and put together a rough chart indicating the Top Ten most prevalent ISPs from each of their vantage points. ISPs or hosts that show up more than others on these various lists are color-coded to illustrate consistency of findings (click the image to enlarge it). The trouble is, all of these individual efforts map badness from just one or a handful of perspectives, each of which may be limited in some way by particular biases, such as the type of threats that they monitor. For example, some measure only phishing attacks, while others concentrate on charting networks that play host to malicious software and botnet controllers.