A “Host” is either an IP address or a domain that you’d like to enable monitoring on.

RBLTracker will check your IP addresses against our list of RBLs, and your domains, against our list of URIBLs and Safe Browsing databases. Both IP addresses and domains will be checked against the Facebook Threat Exchange Data.

It’s important to add your hosts correctly. For example, if you want to monitor your mail servers (the most common type of monitoring), you must add the individual mail server IP addresses. If you add the mail server host name, or your domain name, RBLTracker will not monitor the correct RBLs.