Find the hostname (PTR record) behind any IPv4 or IPv6 address.
How to use Reverse IP Lookup
Enter an IPv4 address such as 8.8.8.8 or an IPv6 address.
Click Find hostname to query its PTR record.
Check the forward lookup column: “Yes, matches” means the hostname points back to the same IP address.
Worked example
Looking up 8.8.8.8 returns dns.google, which resolves back to 8.8.8.8, so it is forward-confirmed. Mail servers without a matching PTR record are often treated as spam.
Who sets the PTR record?
The owner of the IP address block, usually your hosting or internet provider. Ask them to set it if you run a mail server.
Can this list every website on an IP address?
No. Reverse DNS returns the one name the IP owner chose. Finding all domains on a shared server needs a large web crawl database.
Put this guide into practice
Reverse IP Lookup — Find the hostname (PTR record) behind any IPv4 or IPv6 address.