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Check the bottom of this page to get more information about migrations to version 5.

What is a DNSBL?

A DNS-based Blackhole List (DNSBL, Real-time Blackhole List or RBL), is a means by which an Internet site may publish a list of IP addresses, in a format which can be easily queried by computer programs on the Internet. As the name suggests, the technology is built on top of the Internet DNS or Domain Name System. DNSBLs are chiefly used to publish lists of addresses linked to spamming. Most mail transport agent (mail server) software can be configured to reject or flag messages which have been sent from a site listed on one or more such lists (Source)

We are regularly scanning new proxies that are reported to us and we're also trying to keep updated with the "Tor"-network proxies, a network that forgets that anonymity can be a problem when we are speaking abuse.

Resolving Default zone Removed 30 june 2013, reinstated 1 june 2016 due to high use New zone since 22 june 2016

RBL Bitmasking Data

1IP has been reported
Meaning: The ip has been reported from a third party application, honeypot, but may not necessarily be confirmed by our local sweepers (this is for proxies)
As there may be SMTP-servers amongst our hosts, this bit value may be unsafe to use and in the case of SMTP, there is no available confirmation.
2IP has been confirmed as working proxy

June 2016: When FraudBL is used, this mask confirms the host as fraudible (Servers used for phishing, fraud, etc)

8IP was tested, but was never returning anything
Meaning: The ip may be fixed by the owner and therefore it's not working anymore
16June 2016: E-Mail spammer
This is the former field for failed connections, which there is no interest in
32IP is tested and is fully functional but there is a second entry point (meaning this ip is not the same as the one that has been used by the user"), or the address is an exit node in TOR-network
64IP is marked as "abusive". Primary used to point out spam or attacks through webforms, forum, telnet, etc.
June 2016: When FraudBL is used, this mask are also added, which means that - for example - if there is a phishing case (mail) the bit will be set to over 64 (4+16+64).
128IP has a different anonymous-state (web-based proxies, like anonymouse, etc)

Coming soon 


Future Zones

Fraudalent/phishing-tagged e-mail

FraudBL has just been started as a separate project - for the moment you can reach the site at https://fraudbl.orgFraudBL - Explained has been added here at the docs (from, for your convenience.

How about the expire time for FraudBL

Probably, it should be shorter than a regular host.


API References

DNSBL v5 Project

We are currently working on a complete migration to a new system. Here, you can find the status of that project.
Older versions from 2006 are following TornevallWEB versioning (1.x-4.x).

Key Summary T Created Updated Due Assignee Reporter P Status Resolution

Check out our project pages here!

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