The IP address is converted to its reverse-DNS name and a PTR lookup is performed. The returned PTR hostname is shown when one exists.
DNS tool
Reverse DNS lookup
Resolve an IPv4 or IPv6 address back to its PTR hostname.
Quick guide
What is reverse DNS?
Normal DNS maps a hostname to an IP address. Reverse DNS does the opposite by looking for a PTR record associated with an IP address.
PTR records are commonly used for server identification, email infrastructure and troubleshooting. Many residential and dynamic IP addresses either have generic hostnames or no PTR record at all.
- Checking mail-server PTR records
- Finding the hostname attached to a server IP
- Investigating infrastructure and hosting addresses
Terminal shortcut
Prefer the command line?
Resolve an IP back to its PTR hostname.
> rdns 8.8.8.8
Run in Terminal ->