SINGULARis Spam/scam blocklist is created and is being operated by the University of Pécs Faculty of Sciences. They use it internally to fight mostly e-mail floods and phising. Usage is open to everyone but they are not giving any warranties.
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 singular.ttk.pte.hu. 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.