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Reverse DNS records have to be put in by whoever has official authority over the IP. It's most likely your host, or their NOC. Just send them a message and say you need reverse pointers set up for whatever IP, to resolve back to whatever domain you have on the server. They should know exactly what to do and can usually do it within a few minutes.
You don't need 1 ip for every domain. If you're on a shared IP, the IP address just needs a reverse pointer to a valid domain on the server.
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