Better Ethics Online
Publishes black list of spammers and seeks to promote online ethics.

bl.csma.biz - Spam Blacklist
As a public service, McFadden Associates maintains a free DNSBL blacklist. Anyone sending SPAM into their mail filters is automatically added for a period of thirty days.

Blackholes.us
Publishing a variety of DNS blocklists including entire countries and ISP's.

Blacklist of Internet Advertisers
To curb inappropriate advertising on usenet newsgroups and via junk e-mail.

Blacklists Compared
Weekly reports of DNS blacklists lookups of IP addresses (and reverse DNS lookups) that made SMTP connections to the San Diego Supercomputer Center on that week. Useful for getting a grasp of the size of the various blacklists. Maintained by Jeff Makey.

Blitzed IRC Network (OPM.BLITZED.ORG)
A dnsbl of open proxies (HTTP, Socks and wingate), populated by IRC connection scanners and spamtraps.

Blockalert
Provides reports on whether there is recent spam activity within each IP block, especially spamvertised web site addresses. Check if you are sharing your address block with spammers.

Chinese and Korean Net Blocks
Lists IP blocks of China and Korea for those who want to avoid asian spam.

Clueless Mailers
Offers background information on the worst of the new Internet abusers.

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