In DNS management, forward lookups—such as A and CNAME records—are widely known and regularly configured. However, reverse DNS using PTR (Pointer) records is just as critical, especially for email servers, security protocols, and audit logging. This guide provides a technical walkthrough on how to correctly set up PTR records and ensure DNS consistency across your infrastructure.
What Is a PTR Record?
A PTR record maps an IP address back to a hostname. Unlike an A record, which resolves a domain name to an IP, a PTR record performs a reverse lookup: it answers the question, “Which domain corresponds to this IP address?”
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