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I recently grew frustrated at the lack of a good, fast RBL checking web site. So, during the MailChannels summer hackathon on a remote island in the Pacific Northwest, I coded up an AJAX-based blacklist check web page. This new service is a work in progress, but already satisfies a few goals I had in mind at the start of the hackathon:

  1. It’s fast – DNS lookups are done in parallel, so a complete set of results usually comes back in under one second;
  2. It’s easy – IP addresses and host names are accepted, and CIDRs will be added soon; and,
  3. It gives you useful information – such as the ASN and subnet range from which the IP address was allocated.

For those of you who are so inclined, feel free to figure out the wire-line protocol, which is a REST-ful JSON thing. I can’t promise it won’t be rate limited, but I certainly don’t mind if you script it to provide the back-end for your own multi-RBL checking service.

Without further adieu, here’s the link:


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