Do you maintain a list of IPs to block? Note: Hosts file/ DNSKONG and the like which block sites based on domain name are not the same thing. I'm not certain of IEspyad which puts stuff in the restricted zone, but I kind of remembering seeing a few entries though I suspect blocking by domain names + wildcards is the major method. There are certainly merits to using a IP block list, on top of a hosts file, but in the past I never borthered because it was not really easy to do. But I discovered blockmanager recently and it made maintaining IP block lists easy, and you could do it with various apps.