lists IPs and FQDNs
usage policy seems clear: freely exported by anybody who wants to use them«
http://www.gbudb.com/truncate/
+ listing policy
+ usage policy seems implied: free use
+ return codes documented
+ »Truncate is very conservative. On most systems it can be safely used to reject connections!«
http://www.justspam.org/
listing policy documented
warning: relies on listings in other DNSBLs! also for delisting!