http://iplists.firehol.org/ http://iplists.firehol.org/ looks free and very comprehensive. It has whole bunch of sub-lists of IPs that are likely to be sources

http://iplists.firehol.org/ http://iplists.firehol.org/ looks free and very comprehensive. It has whole bunch of sub-lists of IPs that are likely to be sources of abuse, including datacenters and VPNs, and it gets updated frequently. Github: https://github.com/firehol/firehol https://github.com/firehol/firehol