A PTR (Pointer) record is a reverse DNS (rDNS) record that maps an IP address back to a domain name. Unlike standard A records, which resolve domain names to IP addresses, PTR records perform the reverse function, ensuring that an IP address points to a valid domain.

PTR records are crucial for email authentication, as many mail servers use them to verify the legitimacy of incoming emails. Without a proper PTR record, emails from a server may be marked as spam or rejected entirely. They also play a role in network troubleshooting and security monitoring, helping identify and verify hosts within a network.

To set up a PTR record, the IP address owner (usually your hosting provider or ISP) must configure it in the reverse DNS zone. Proper configuration ensures trustworthiness for email services and enhances network security. Find out how PTR records work and why they’re essential for email authentication and network security.