Get the hostname corresponding to an IP address.
The reverse IP lookup tool performs a reverse DNS (PTR) query to find the hostname assigned to an IP address. You can also type a domain or paste a URL, and its IP address is resolved first.
Reverse DNS is used to verify search engine crawlers (a real Googlebot IP resolves to googlebot.com), to configure mail servers, since many providers reject email from IPs without a valid PTR record, and to identify the network behind an IP.
Get the hostname that the IP address points back to.
Confirm whether a visit really comes from a search engine bot.
Make sure your mail server has a valid reverse DNS record.
Enter a domain or URL and the IP is resolved automatically.
Reverse DNS maps an IP address back to a hostname, the opposite of a regular DNS lookup.
When no PTR record exists for the IP, the lookup returns the IP address unchanged.
Run a reverse lookup on the IP, check that the hostname ends in googlebot.com or google.com, then run a forward lookup to confirm it resolves back to the same IP.
The owner of the IP address block, usually your hosting provider or ISP.