Reverse DNS Lookup
NewPerform reverse DNS lookups to find the hostname(s) associated with an IP address using PTR records. Enter an IPv4 or IPv6 address to see the reverse DNS entry. Also explains the PTR record format and how reverse DNS works. Useful for network troubleshooting, spam filter configuration, email server verification, and security investigations. Note: Browser-based DNS lookups use the DNS over HTTPS API.
Reverse DNS Lookup
Analyze IP addresses — identify if they are public, private, or loopback. Provides IP classification info.
Full reverse DNS lookup requires server-side DNS resolution. This tool provides IP classification and analysis.
How to Use Reverse DNS Lookup
- 1Enter an IPv4 or IPv6 address
- 2View the PTR record hostname
- 3Check if reverse DNS matches forward DNS
- 4Use for email deliverability or security checks
About Reverse DNS Lookup
Perform reverse DNS lookups to find the hostname(s) associated with an IP address using PTR records. Enter an IPv4 or IPv6 address to see the reverse DNS entry. Also explains the PTR record format and how reverse DNS works. Useful for network troubleshooting, spam filter configuration, email server verification, and security investigations. Note: Browser-based DNS lookups use the DNS over HTTPS API.
Your Privacy is Protected
Reverse DNS Lookup runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
Why does email need reverse DNS?
Mail servers check PTR records to verify that the sending IP has a matching hostname. Missing or mismatched rDNS is a spam signal and can cause email delivery failures.
Why Use This Tool?
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