Reverse DNS Lookup


This reverse DNS Lookup tool will query the DNS system to find a hostname mapped to an IP address. An IP address can be mapped to multiple domain names, or it may be mapped to none. In such scenarios, no hostname will be returned by this tool.

Enter an IP Address:




Why do you need reverse DNS Lookup?

Reverse DNS (Domain Name System) lookups are used for several reasons, including:

  1. Verifying the authenticity of an email: Reverse DNS lookups can be used by mail servers to verify that an incoming email is actually coming from the domain it claims to be from. Use our Trace Email tool to trace an email.
  2. Blocking unwanted traffic: Reverse DNS lookups can be used by firewalls or other security devices to block traffic from specific IP addresses or IP ranges.
  3. Improving email deliverability: Reverse DNS lookups can help determine if an email server is on a dynamic IP address, which can negatively impact email deliverability. A properly configured reverse DNS record can help improve email deliverability by ensuring that the IP address is associated with a domain name. To learn more about email delivery issues, please read our email delivery problems article.
  4. Troubleshooting network issues: Reverse DNS lookups can be used by network administrators to troubleshoot issues with IP addresses, such as connectivity problems or incorrect routing.
  5. Improving server performance: Reverse DNS lookups can be used by web servers to determine the hostname of a client's IP address, which can be useful for logging and tracking purposes.

Overall, reverse DNS lookups are an important tool for managing and verifying the integrity of network communications, improving the delivery of emails, and ensuring the security of a network.