This tab shows the list of banned IP addresses for a site that is selected by the Site drop-down list. If you select (global), IPs that are banned globally for all sites will be displayed. New IPs can be added to the lists using the New banned IP link.
You can edit () or delete () listed IP addresses. After clicking the icon in the header of the Actions column, a context menu is displayed, offering options for export of listed data to various types of files.
More resources can be found at Developer's Guide -> Modules -> Banned IPs -> Overview.