IP Address comply with reverse hostname naming convention

Hello, does anyone know what this statement means: Does IP Address comply with reverse hostname naming convention... Failed!
I got this feedback from a blacklist we are on, but I do not know what it is and therefore. . can't correct it.

Thanks.
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More about address comply reverse hostname naming convention
  1. You need to contact your ISP and get them to change it on their DNS server.

    The change needs to be made on the DNS server of the company from which you lease your IP address. Your reverse DNS entry should resolve back to your public server name. ISP's don't do this unless specifically requested.
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