Domain Tools

Reverse DNS Lookup

Find the hostname (PTR record) that an IP address points back to.

Enter an IP address (or a domain, to look up its IP first).

Not sure what to enter? Try an example: 8.8.8.8

Free & instant No signup How to use FAQ

Found

8.8.8.8

IP Address

8.8.8.8

IP Version

IPv4

Hostname

dns.google

Last checked: 0 seconds ago Live

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Enter an IPv4 or IPv6 address to look up its PTR record - the hostname the address points back to.

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Reverse DNS Lookup - 8.8.8.8 0 seconds ago

What is a reverse DNS lookup?

A reverse DNS lookup turns an IP address back into a host name by reading its PTR record. Mail servers use it to judge whether a sending server is legitimate, and it helps identify which network or provider an IP address belongs to.

How to do a reverse DNS lookup

Enter an IP address (for example 8.8.8.8) or a domain in the box above.
Click Look Up.
Read the host name returned by the PTR record.
If you run a mail server, make sure its IP has a PTR record that matches the server's host name - missing reverse DNS often sends email to spam.

Related checks

To find a website's IP address first, use IP Address Lookup.
To check the reverse DNS of a domain's mail servers, use the Mail Server Lookup.

JustChecker tracks your server's DNS configuration continuously.

Frequently Asked Questions

Many receiving mail servers reject or spam-filter mail from an IP without a PTR record, or whose PTR hostname doesn't match the sending server. Every mail server should have one.

PTR records are controlled by whoever owns the IP address - your hosting or cloud provider - not your domain's DNS. Request it in their control panel or through support.

The provider set a default PTR. That's fine for a website, but a mail server should use a proper name such as mail.example.com.

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