Reverse DNS Delegation
When you register a domain name with a domain registrar, you usually become responsible for that Forward DNS domain. In DNS terms, the domain is delegated to you.
However, you are not also responsible for your reverse records. Your Reverse DNS records are still most likely to be the responsibility of your hosting facility or ISP.
To make changed to your Reverse DNS PTR records, you must contact the company where you get your IP addresses from, usually a hosting facility or an ISP.
Alternatively, your ISP or hosting company may delegate a range of IP addresses to you, in which case you must configure Reverse DNS and PTR records in your DNS server.
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