What This Tool Does:
- The tool accepts an IP address or domain name. If a domain is provided, it resolves its A record to get the IP address.
- It converts the IP address into reverse notation (e.g., "192.0.2.1" → "1.2.0.192.in-addr.arpa") and performs a PTR lookup to obtain the hostname.
Why Reverse DNS Matters:
- Verification: A correct PTR record confirms that your IP is properly associated with a hostname, which is important for email deliverability and overall network reliability.
- Security: Consistent reverse DNS records can reduce the risk of IP spoofing.
How to Interpret the Results:
- If a valid PTR record (e.g., "mail.example.com.") is returned, reverse DNS is configured correctly.
- If no PTR record is found, or an error is shown, it may indicate that the reverse DNS is not set up, which can impact services like email.
Example Output:
Verify that the hostname in the PTR record matches your server's expected domain.