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The Spamhaus XBL
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Associated Documents

DNSBL Usage Terms
How Blocklists Work
The ZEN Blocklist
Datafeed Service
Exploits Block List

The Spamhaus Exploits Block List (XBL) is a realtime database of IP addresses of hijacked PCs infected by illegal 3rd party exploits, including open proxies (HTTP, socks, AnalogX, wingate, etc), worms/viruses with built-in spam engines, and other types of trojan-horse exploits.

If your IP address is listed by the XBL, see the XBL FAQs for solutions

Incorporates CBL data

XBL is a list of spam sources due to exploited computers or other devices. It is mostly composed of--as well as the primary distribution zone for--CBL data ( It may also include other lists of spam sources due to exploited computers and other devices.

NJABL closing information

The NJABL has announced it is shutting down and is now serving an emtpy zone. NJABL should not be queried by any system from now on, and accordingly has been removed from XBL. For more information, please visit

XBL Usage

The Exploits Block List can be used by all modern mail servers, by setting your mail server's anti-spam DNSBL feature (sometimes called "Blocklist DNS Servers" or "RBL servers") to query XBL is also part of a combined DNSBL comprising SBL, XBL and PBL, see: ZEN

Mail servers already using should NOT also use or you will be making 'double' queries to basically the same data source and only one DNSBL will appear to work (the other(s) will appear to not catch anything).

For information on CBL see

Use of the Spamhaus DNSBLs is free of charge for low-volume non-commercial use. To check if you qualify for free use, please see: Spamhaus DNSBL usage criteria.

DNSBL Usage Terms
Use of Spamhaus's free public DNSBL service is restricted to low-volume non-commercial users only. To make sure you qualify for free use, please see the terms:
DNSBL usage terms

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