Spamhaus Exploits Block List (XBL)
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
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 (cbl.abuseat.org). It may also include other lists of spam sources due to exploited computers and other devices.
We monitor this blacklist since 2015-01-01. More information: http://www.spamhaus.org/xbl/