https://knowledge.validity.com/hc/en-us/sections/204468388-Blocklists
https://github.com/zbetcheckin/DNSBLs
https://en.wikipedia.org/wiki/Comparison_of_DNS_blacklists
+ https://www.impressionwise.com/kb/threats/rbl-advisories.html
00_ELANG
http://dnsbl.aspnet.hu/
hungarian?
domain is for sale
http://rbl.dns-servicios.com/rbl.php
website can not be found
+ http://spamcannibal.org/
+ dead, as of at least 2018
00_NEEDS_RECHECK
https://antispam.imp.ch/
no usage policy
listing policy seems to be: they received spam from an IP
usage policy: Anyone can use this RBL list [sic]
return codes: probably boolean, i.e. either listed or not
+ http://relaytest.kundenserver.de/
+ by 1und1 (now ionos?), used internally
+ https://www.blalert.com/dnsbl/relays.bl.kundenserver.de
+ no usage policy found
+ no listing policy found
+ no return code explanation found
00_E_PAID
00_E_PRIVATE
88.blacklist.zap
return codes
not documented, probably only boolean
http://rbldata.interserver.net/
- may be dead: http://www.blalert.com/dnsbl/rbl.interserver.net
- http://relaytest.kundenserver.de/
+ listing policy more or less clear
+ usage policy not given but since usage is explained it’s probably free for all
+ return codes seem to be binary, i.e. either listed or not
+ lists IPs
+ lists domains/URIs
http://rv-soft.info/
- http://spamcannibal.org/dnsbl_check.shtml
+ usage policy not explicit but seems to be free
+ listing policy also not explicit but can be inferred from return code explanation
+ return codes are explained
http://spamrats.com/
http://spamstinks.com/
http://st.technovision.dk/