Is there an open database of blacklisted IP for the Web? With a lot of public web proxy you know... such the blacklist used by the Global blocking of Wikipedia.
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There are many black lists out there. Anything specific you're looking for? – Aaron Digulla Nov 19 '09 at 10:05
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Yes, I would like a IP database of public web proxies (in order to block them requests). – T5i Nov 19 '09 at 10:34
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Depending on where or how you're looking at using this, you might be better off asking on serverfault. – Chris J Nov 19 '09 at 13:07
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The Peerblock lists are good. – leppie Jan 25 '11 at 08:29
4 Answers
The Project Honeypot provides as service called Http:BL. As an active member of Project Honeypot you can query their database of IPs that are known as email address harvesters or comment spammers.
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No. You can make live DNS queries as described in http://www.projecthoneypot.org/httpbl%5Fconfigure.php – Nov 19 '09 at 10:33
You can use Blacklist IP Addresses Live Database from myip.ms -
http://myip.ms/browse/blacklist/Blacklist_IP_Blacklist_IP_Addresses_Live_Database_Real-time
They have latest Blacklist IPs collected during the last 10 days for use in .htaccess file or in website firewall.

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Google has a Safe Browsing API that lets you check against a db of hashed values. It's public and it's encrypted. They have two databases; phishing and malware data in 2 separate blacklists. However, they contain hostnames, not IPs, but perhaps its something you could use.

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For blackips (optimized for iptables/ipset)
https://github.com/maravento/blackip
For blackdomains (optimized for squid)