- Abusive Hosts Blocking List
- Database of hosts that have been known to cause various forms of abuse on the Internet including spam, denial of service attacks, and cracking attempts.
- BlockAlert
- Source for information on spam activity based on IP block hierarchy addressing the concerns of consumers and providers of Internet services.
- Composite Blocking List
- Provides source data from spamtraps, and only lists ip's exhibiting characteristics which are specific to open proxies of various sorts which have been abused to send spam, or worms/viruses.
- Electric Eye Ultimate Banned List
- Bans unsolicited junk e-mailers and faxers, domains with insistent pop-ups and pop-unders, and e-mail services that don't have an anti-spam policy.
- McFadden Associates E-mail Blacklist
- Public service maintaining free DNSBL spam blacklists. Automatically lists servers that send spam through the McFadden mail filters for a thirty-day period until a removal request is made.
- Not Just Another Bogus List
- Maintains a list of known and potential spam sources that network or mail administrators can use to protect their mail servers from abuse.
- OpenRBL
- Searchable database of spammers sorted by either ip address or host name.
- The ROKSO List
- List of 100 known spam operations in different parts of the world accountable for 80% of spam occurrences.
- SpamCop Blocking List
- Collection of IP addresses that have been reported to be involved in spamming activities. Aims to stop most unsolicited message without blocking wanted mail.
- Spamhaus Block List
- Real-time database of IP addresses of verified spam sources and operations. Listing policy and delisting procedure presented.
- Spamikaze
- Free collection of programs developed to easily build a DNSBL or a spam block list.
- UCEPROTECT-Network Project
- Online home of Germany's first spam protection database. Presents policy information, answers to frequently asked questions about spam, help for ISPs, and marketing tips.
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