Dnsbl
dnsbl.info
DNS-based block list information/database. Resource to find out information on DNS block lists and check IPs to see if the are block listed in over 100 blacklist in just seconds.
179,978 
$ 61,800.00
valli.org
Free multiple DNSBL/RBL lookup and FCrDNS check tool. Test the IP (IPv4 or IPv6) of your mailserver on more than 200 blacklists and whitelists.
158,356 $ 70,200.00
dnsqueries.com
DNSQueries provides network tools and lets you make every needed network test, such as domain health tests, RBL checks, dns lookup, ptr queries, host geographical informations,...
216,740 $ 37,800.00