What do the 127.*.*.* Return Codes mean in DNSBLs?
Back
What do the 127.*.*.* Return Codes mean in DNSBLs?
Spamhaus uses this general convention for return codes:
Return Code Description 127.0.0.0/24 Spamhaus IP Blocklists 127.0.1.0/24 Spamhaus Domain Blocklists 127.0.2.0/24 Spamhaus Zero Reputation Domains list 127.255.255.0/24 ERRORS (not implying a “listed” response)Currently used return codes for Spamhaus public IP zones:
Return Code Zone Description 127.0.0.2 SBL Spamhaus SBL Data 127.0.0.3 SBL Spamhaus SBL CSS Data 127.0.0.4 XBL CBL Data 127.0.0.9 SBL Spamhaus DROP/EDROP Data (in addition to 127.0.0.2, since 01-Jun-2016) 127.0.0.10 PBL ISP Maintained 127.0.0.11 PBL Spamhaus Maintained
127.0.0.5-7 are allocated to XBL for possible future use; 127.0.0.8 is allocated to SBL for possible future use.
See the DBL FAQ for return codes for DBL.
The following special codes indicate an error condition and must not be taken to imply that the object of the query is “listed”:
Return Code Zone Description 127.255.255.252 Any Typing error in DNSBL name 127.255.255.254 Any Query via public/open resolver 127.255.255.255 Any Excessive number of queriesBack