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A PTR (Pointer) record provides reverse DNS lookup, mapping an IP address to a domain name. It's the opposite of an A or AAAA record, allowing you to find out what domain name is associated with a given IP address.
Example for IPv4:
1.2.3.4.in-addr.arpa. IN PTR mail.example.com.
Example for IPv6:
4.3.3.7.0.7.3.0.e.2.a.8.0.0.0.0.3.a.5.8.8.b.d.0.1.0.0.2.ip6.arpa. IN PTR mail.example.com.
Ensure PTR records match corresponding A/AAAA records for proper forward-confirmed reverse DNS.
Choose descriptive hostnames that indicate the server's purpose (e.g., mail.example.com).
Periodically verify PTR records are correctly configured, especially for mail servers.
IP addresses must be reversed and properly formatted in the .arpa domain.
PTR records often require delegation from your ISP or hosting provider.
Forward and reverse DNS records not matching can cause email delivery issues.
When setting up mail servers, configure both forward (A/AAAA) and reverse (PTR) records to ensure reliable email delivery and prevent your messages from being marked as spam.
IPv6 PTR records are more complex due to the longer address format. Use tools to generate the correct reverse DNS notation in the ip6.arpa domain.
While technically possible to have multiple PTR records for one IP, it's generally recommended to maintain a one-to-one relationship between IPs and hostnames.
Proper PTR records are crucial for email authentication and preventing your messages from being blocked.
PTR records help identify the source of network connections, aiding in security monitoring and troubleshooting.