Have you considered simply contributing to the service at http://www.hostip.info/ http://www.hostip.info/ ? They seem to be doing what you describe, and have be

Have you considered simply contributing to the service at http://www.hostip.info/ http://www.hostip.info/ ? They seem to be doing what you describe, and have been around long enough to have reasonably good information (in my experience)— I'm sure they would make use of any additional data, or hacking on their backend, which you might provide.