Spamhaus ZEN RBL

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To see if an IP address is listed in the Spamhaus ZEN RBL,  log into dnscache1.ties2.net or dnscache2.ties2.net and enter the following query.

dig @127.0.0.1 +short <reverse IP Address>.zen.dnsbl.

For example:

 dig @127.0.0.1 +short 2.128.169.204.zen.dnsbl. 
127.0.0.4
 
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 zen.spamhaus.org returns the following result codes for listed entries (see the FAQs for a more complete return code table):

Return Codes Data Source Contains
127.0.0.2 Direct UBE sources, spam operations & spam services
127.0.0.3 Direct snowshoe spam sources detected via automation
127.0.0.4-7 CBL (3rd party exploits such as proxies, trojans, etc.)
127.0.0.10-11 End-user Non-MTA IP addresses set by ISP outbound mail policy

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