IP Blacklist Check — RBL Lookup for Mail Servers
Check whether an IPv4 address is listed on multiple public RBLs (real-time blackhole lists) at once — essential for mail server operators.
How to use
Check an IPv4 address against several public RBLs (real-time blackhole lists) at once to find out whether it is flagged for spam or abuse — especially useful for mail server operators.
- Enter an IPv4 address in the search box.
- Press "Submit" to fan out the request to multiple RBL providers.
- The result table marks each source as "Clean" or "Listed".
- If a listing appears, follow the link to the provider to see the reason and removal steps.
Some RBLs throttle free queries, so a missing response is not the same as "clean". For listed mail servers, also audit SPF, DKIM, DMARC, and recent sending patterns.