The custom RBL feature lets you add custom RBLs and URIBLs to your account, that RBLTracker does not normally monitor.
If you have a paid or in-house RBL that you’d like to use, you can add it here and centralize your monitoring with RBLTracker, and take advantage of our automated checks and alerting functionality.
You can add a Custom RBL via the Manage -> Custom RBLs section of the RBLTracker portal:
Simply select the RBL type (either RBL or URIBL), and specify the hostname of the RBL to add.
Your blacklist must be set up like a standard DNSBL, as per this this description.
Once you’ve added the custom RBL, you must remember to enable this RBL on your RBL Profile.