I also tweet, blog and . Contact Me|Research

Blocklists of Suspected Malicious IPs and URLs

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.

My other lists of on-line security resources outline Automated Malware Analysis Services and On-Line Tools for Malicious Website Lookups.