Frequently Asked Questions

What is Reverse DNS?

Reverse DNS (rDNS) maps an IP address back to a hostname using PTR records, often used for verification and diagnostics.

Why is Reverse DNS important for email?

Many receivers check rDNS as part of anti-spam measures. A matching PTR and hostname can improve trust and deliverability.

Can Reverse DNS be used for IPv6 addresses?

Yes. rDNS supports IPv4 and IPv6. IPv6 uses the ip6.arpa domain with reversed nibbles in the PTR name.

How do I change Reverse DNS settings?

Update the PTR record with your hosting or IP address provider. The owner of the IP space controls PTR records.

What happens if Reverse DNS fails?

Failure can cause mail rejection or flagging as spam and can reduce trust in other network services.