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Reverse DNS Lookup

Find the hostname associated with an IP address.

What is Reverse DNS Lookup?

Reverse DNS Lookup finds the hostname associated with an IP address by querying PTR records. Instead of converting a domain to an IP, it converts an IP back to a domain name. Essential for verifying mail server identity and investigating suspicious traffic.

How to use this tool

  1. Enter the IP address you want to look up (IPv4 or IPv6).
  2. Click Lookup to query the PTR record.
  3. Review the returned hostname — this is the domain assigned to that IP.
  4. Verify by doing a forward lookup on the hostname to confirm it points back to the same IP.
  5. Use the information for mail server verification or abuse investigation.

Frequently asked questions

What is a PTR record?
A PTR record maps an IP address to a hostname, stored in a special reverse DNS zone. It matters most for email — many mail servers reject messages from IPs without a valid PTR record.
Why does my lookup return no result?
Not every IP has a PTR record. The IP block owner (usually your hosting provider) must create it. Most cloud providers let you set PTR records through their control panel.
How do I set up reverse DNS?
Contact your hosting provider or set it in their control panel. The PTR record should match your server's hostname, and that hostname should resolve forward to the same IP.
Can reverse DNS reveal IP ownership?
It shows the hostname the IP owner configured, often revealing the hosting provider. For full ownership details, use a WHOIS lookup on the IP address instead.

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