Delisting IP addresses from Realtime Blackhole Lists (RBLs)

Expertise level: Medium 

Realtime Blackhole Lists (RBLs) list IP addresses whose owners do not stop the proliferation of spam. The RBL usually lists server IP addresses from ISPs whose customers are responsible for the spam and from ISPs whose servers or websites are hijacked for spam sending activities. 

Before requesting a delisting of your IP address to any RBL, you have to make sure the spam source has been blocked. You can verify your mail server logs, and make sure that there is no remaining spam in your outbound mail queue.

Some RBLs can also list your IP for other abusive activities. In such case they provide more explanations regarding the listing on there website.

To delist your IP from these lists, follow these instructions:

  1. Go to this online tool:  (Replace XX.XX.XX.XX by the IP address).

    As an alternative, you can go the the home page and enter the IP address that you want to check, then click on the "Blacklist Check" button.
  2. The status of the IP in the different DNSBLs will be displayed (first column).

  3. To delist the IP from a specific DNSBLS, click on the "Detail" button.
  4. Close the window.



5. For Barracuda, as an example, click on the link displayed in the last paragraph: "More information about BARRACUDA can be found at their website:"

  1. Follow the instructions to request the delisting of your IP address.
  2. Do the same for all the other DNSBLs where your IP address is listed. (Steps 4 to 7).


Additional online tool


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