Several organizations maintain and publish blocklists (a.k.a blacklists) of IP addresses and URLs of systems and networks suspected in malicious activities on-line. Many of these lists are available for free; some have usage restrictions:
The lists differ in format, goals, and data-collection methodology. Be sure to read about the list before making use of it.
Any blocklist sources that should be on this list, but are missing? Let me know.
For a listing that includes SPAM blacklists and lookups, take a look at OkamalO's page of Malicious IPs and URL FREE Databases.
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