DNS
Reverse DNS (PTR) Lookup
Find the hostname behind an IP address using a PTR lookup.
Resolved in your browser via DNS-over-HTTPS. Free.
About this tool
Free reverse DNS lookup tool. Convert an IP address to its PTR hostname using DNS-over-HTTPS, useful for email and security checks.
Frequently asked questions
Why does reverse DNS matter for email?
Many receivers expect a PTR record that matches your sending hostname; missing PTRs hurt deliverability.
Do you support IPv6?
Yes, IPv4 and IPv6 reverse lookups are supported.
Who controls PTR records?
The owner of the IP block, usually your hosting provider, so you set it in the panel.
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