RBL Watcher allows users to check and monitor IP addresses against 77 Real-time Blackhole Lists (RBLs). These are lists of IP addresses linked to activities such as spamming. Developers can use the RBL Watcher API to retrieve all of the IP addresses they're watching and, of those, the ones that are blacklisted and the ones that are not blacklisted. They can also add or remove an IP address from their watchlist or retrieve details on a given IP address.
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