ORBITrbl is a service provided by ORBITnet for its clients and servers. They list IP's where they have received more than 3 complaints from their own customers or IP's which send email to their spam traps. They can also list a Class C Network if they receive more than 10 spam.
They will unlist an IP if the IP is not dynamically assigned and has stopped sending SPAM. The IP must also have a rDNS and a FQDN.
IP Black Listed - http://www.orbitrbl.com/rbl/rbl.php?ip=
Is the information on our site wrong or incomplete? You don't want us to monitor your blacklist? Or do you operate a similar blacklist? We would like to hear from you!