https://www.blacklistmaster.com/
https://knowledge.validity.com/hc/en-us/sections/204468388-Blocklists
https://github.com/zbetcheckin/DNSBLs
+ https://en.wikipedia.org/wiki/Comparison_of_DNS_blacklists
00_ELANG
http://dnsbl.aspnet.hu/
hungarian?
bitmasked
127.0.0.1 means blocked
http://zapbl.net/
+ lists domains/URIs
+ lists IPs
+ listing policy seems clear
+ https://zapbl.net/policy
+ usage policy seems clearly free for everyone
+ https://zapbl.net/using
+ return codes are documented
+ seems well done
https://rbl.foobar.hu/
+ lists domains/URIs
+ lists IPs
+ listing policy seems clear
+ usage policy seems clearly free for everyone
+ return codes are documented
+ possibly unmaintained or dead
+ footer says: ©2013-14
http://apews.org/?page=filter
questionable
+ https://www.dnsbl.com/search/label/apews
+ https://whatismyipaddress.com/apews
+ dead?
+ no news on http://apews-user.blogspot.com/ since 2014
+ not further looked into because of the above
http://www.spamhauswhitelist.com/en/
https://www.dnswl.org/
00_E_FOCUS