Reverse DNS Lookup
Find the hostname associated with an IP address.
How to Use Reverse DNS Lookup
Enter an IPv4 or IPv6 address (e.g., 8.8.8.8 or 2001:4860:4860::8888).
Click the 'Lookup IP' button.
View the PTR record and associated hostnames for the given IP address.
Why Use This Tool?
Verify Mail Servers
Many email providers will reject emails from IP addresses that do not have a valid Reverse DNS (PTR) record.
Identify Network Owners
Find out which hosting company or ISP owns a specific IP address by looking at the reverse hostname.
Security Auditing
Analyze suspicious IP addresses in your server logs to see where they resolve back to.
Understanding Your Results
PTR Record
Pointer records resolve an IP address to a domain or hostname, the exact opposite of an A record.
in-addr.arpa
The special domain name space used for reverse DNS lookups in IPv4. The IP address is reversed and appended with .in-addr.arpa.
No Records Found
It is very common for residential or dynamic IPs to not have a reverse DNS record configured.
Important Notes
- Results are provided for informational purposes only.
- External API limits may apply to this tool.
- Do not use this tool for malicious scanning or targeting.
Privacy & Security
- Requests are processed securely. We do not store your scan history.
- We do not collect personal information from tool inputs.
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