stopped in 2013
http://countries.nerd.dk/
unable to connect, also for nerd.dk
+ http://dul.ru/dul.en.html
+ DEAD for sale
+ http://dns.measurement-factory.com/surveys/openresolvers.html
+ dead
+ »The following text describes past open DNS resolver surveys and an associated DNS lookup service that has been long shut down«
+ http://www.sectoor.de/tor.php
+ timeouts
00_NEEDS_RECHECK
https://antispam.imp.ch/
no usage policy
korea
http://korea.services.net/
00_LISTS_DIALUPS
- http://dul.ru/dul.en.html
- DEAD for sale
00_LISTS_OPENRESOLVERS
- http://dns.measurement-factory.com/surveys/openresolvers.html
00_LISTS_TORNODES
- http://www.sectoor.de/tor.php
https://www.dan.me.uk/dnsbl
https://0spam.org/
clear information on usage policy