»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
+ http://anticaptcha.net/
+ for sale
00_NEEDS_RECHECK
https://antispam.imp.ch/
no usage policy
nbl.0spam.org Network Black List | Spam Source Networks, high volume of spam trap hits in a Class C block will result in network listings in this DNSBL.
url.0spam.org URL Black List | This list contains the IP address of domains found to be in the source of spam emails found in our traps.
return codes not very clear
- http://anticaptcha.net/
http://blacklist.lashback.com/
http://ubl.unsubscore.com
http://blacklist.woody.ch/rblcheck.php3