Reverse DNS Lookup
Find the hostname associated with an IP address using PTR records
Reverse DNS (rDNS) maps an IP address back to a hostname using PTR records. This is the opposite of a regular DNS lookup which maps hostnames to IP addresses.
How it works: The IP address is reversed and appended with.in-addr.arpa (for IPv4) or.ip6.arpa (for IPv6), then a PTR record lookup is performed.
Common uses: Email server verification, network troubleshooting, security analysis, and identifying the owner of an IP address.
Features
- Convert IP addresses to hostnames
- Support for both IPv4 and IPv6
- Query both Google and Cloudflare DNS
- View the PTR query being made
- Compare results from multiple providers
- Copy results with one click
Frequently Asked Questions
What is reverse DNS?
Reverse DNS (rDNS) maps an IP address back to a hostname using PTR records. This is the opposite of a regular DNS lookup which maps hostnames to IP addresses.
Why might reverse DNS fail?
Not all IP addresses have PTR records configured. The IP owner must set up reverse DNS, and many don't. This is common for residential IPs and some cloud services.
What is reverse DNS used for?
Common uses include email server verification (to reduce spam), network troubleshooting, security analysis, and identifying the owner of an IP address.