Spamhaus ZEN RBL

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To see if an IP address is listed in the Spamhaus ZEN RBL,  log into or and enter the following query.

dig @ +short <reverse IP Address>.zen.dnsbl.

For example:

 dig @ +short
If there is no return code, then the IP is not listed.   The following are the possible return codes and their meaning:
ZEN Return Codes

Querying returns the following result codes for listed entries (see the FAQs for a more complete return code table):

Return Codes Data Source Contains Direct UBE sources, spam operations & spam services Direct snowshoe spam sources detected via automation CBL (3rd party exploits such as proxies, trojans, etc.) End-user Non-MTA IP addresses set by ISP outbound mail policy

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