I hate block lists... But after careful consideration, we do recommend blocking traffic from these two netblocks: InterCage Inc.: 69.50.160.0/19 (69.50.160.0 - 69.50.191.255) Inhoster: 85.255.112.0/20 (85.255.112.0 - 85.255.127.255) They have been associated with a number of high profile criminal activities in the past. A good number of WMF exploits use name servers or other resources in these netblocks. They have been non responsive to current and past requests to remove malicious content.