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!
We keep some statistics on blacklists. Below is the graph for rbl.orbitrbl.com. We test blacklists by asking them to respond to known IP's that are blacklisted and known IP's that can't be blacklisted. Not every blacklist has such IP's, we test them with what is possible. We keep if we get any response or error messages and the response duration. Lower response times are better. These statistics may be useful for email server administrators to pick which blacklist to use.