+ http://www.spamhauswhitelist.com/en/
+ looks like a parked domain with ads
+ http://stopspam.org/rblcheck/index.php
+ aka dul.pacifier.net
+ http://www.stopspam.org/rbl-info/
+ 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