IP to Domain Lookup Tool

Instantly check PTR (reverse DNS) records for any IP address

Ensure your IP address resolves to the correct domain. Troubleshoot email delivery, verify DNS setup, and check global reverse DNS configuration in seconds.

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Enter an IP address above and click Check PTR to see reverse DNS records here.

Reverse DNS Lookup Tool

What is a PTR Record (Reverse DNS)?

A PTR record (Pointer Record), also known as a reverse DNS record, is a type of DNS record that maps an IP address to a domain name. Unlike standard DNS records (such as A or AAAA records) that resolve a domain to an IP address, PTR records perform the opposite function: they resolve an IP address back to a hostname. This process is called reverse DNS lookup.

  • Email deliverability: Many mail servers use PTR records to verify that an IP address sending email matches its domain, helping to prevent spam and improve trust.
  • Network diagnostics: PTR records are used in network troubleshooting, logging, and security audits to identify the hostnames behind IP addresses.
  • Compliance: Some services and security standards require valid reverse DNS records for IP addresses.

How to Use the PTR Record Lookup Tool

This free online tool allows you to instantly check the PTR (reverse DNS) records for any IPv4 or IPv6 address. Simply enter the IP address you want to look up, and the tool will display the associated domain name(s), TTL, and perform a Forward-confirmed reverse DNS (FCrDNS) check to verify if the PTR domain resolves back to the original IP address.

  • Quickly verify reverse DNS setup for mail servers and network devices.
  • Check FCrDNS status for improved email deliverability and security.
  • Export results as CSV or copy them for documentation and troubleshooting.
  • Supports custom DNS resolvers for advanced users.

Why is Reverse DNS Important?

Reverse DNS is a critical part of internet infrastructure. It helps:

  • Prevent email spoofing and spam by verifying sender IPs.
  • Improve network transparency and traceability.
  • Meet requirements for certain web services and compliance standards.

Frequently Asked Questions

What happens if my IP has no PTR record?
Some email servers may reject or flag your messages as spam, and your IP may be harder to identify in logs.
Can I have multiple PTR records for one IP?
Technically possible, but not recommended. Most systems expect a single PTR record per IP address.
How do I set or update a PTR record?
PTR records are managed by the owner of the IP address block, usually your hosting provider or ISP. Contact them to request changes.

PTR Record Lookup Tool by ShowDNS.net — Instantly check reverse DNS records for any IP address. Improve your email deliverability, network security, and DNS configuration today.