Google releases data from its Safe Browsing program, which flags and warns users about 10,000 suspicious and malicious Web sites each day. The most malicious U.S. network listed by Google is a data center run by a company in New York called Pilosoft. Other top badness concentrations include Santrex Internet Services, a well-known bulletproof hosting provider based in the Seychelles. Googles data is broken down by autonomous system (AS) numbers.”]
Source: https://krebsonsecurity.com/2013/06/web-badness-knows-no-bounds/