The Unsubscribe Blacklist (UBL) IPv4

The Unsubscribe Blacklist (UBL) is a real-time blacklist of IP addresses which are sending email to names harvested from suppression files. IP addresses listed on this service is being continually monitored and the list is updated hourly.

Are you the maintainer of ubl.unsubscore.com?

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!