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DNS queries use the reversed `in-addr.arpa` (IPv4) or `ip6.arpa` (IPv6) namespace.
Free DNS tool
Check what hostname an IP address points back to.
Convert an IPv4 or IPv6 address into its reverse-DNS name and query the PTR record through a public DNS-over-HTTPS resolver. Useful for mail-server identity, service inventory and troubleshooting.
PTR result
Reverse DNS
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Resolver validation state will appear here.
What PTR means
Reverse DNS is a DNS record, not proof of ownership or reputation.
Mail servers often care about reverse identity
PTR is one part of a mail server's identity. Sending systems may also evaluate forward DNS, HELO/EHLO identity, SPF, DKIM, DMARC, reputation and many other signals.
Forward and reverse records are separate
A PTR answer does not automatically create an A or AAAA record back to the same address. When identity matters, check both directions.
The IP provider normally controls PTR
Reverse-DNS delegation is typically managed by the network/IP provider rather than by the ordinary authoritative DNS zone for your domain.
Email troubleshooting
PTR is only one mail-DNS check.
Use the email-DNS checker for MX, SPF, DMARC, optional DKIM and related DNS signals. Passing those checks still does not guarantee inbox placement.