What is rDNS (Reverse DNS) or PTR Record?

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Reverse DNS (rDNS) lookup is the reverse of the usual “forward DNS lookup” where the DNS is queried for the IP address of a certain hostname. In reverse DNS, the DNS is queried for the hostname of a certain IP address. A reverse DNS lookup returns the hostname of an IP address.
rDNS is required by some services and especially in SMTP servers to give Higher delivery rates and better sending scores.

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