🔄 Reverse DNS Lookup
Perform reverse DNS lookup to resolve IP addresses back to domain names. Essential for verifying email server configuration and network troubleshooting.
📖 What is Reverse DNS?
- PTR Records: Maps IP addresses back to domain names
- Email Delivery: Many mail servers check rDNS to prevent spam
- Network Troubleshooting: Identify servers and network devices
- Security: Verify legitimate servers and detect suspicious IPs
- IPv4 & IPv6: Works with both address formats
❓ Frequently Asked Questions
What is reverse DNS lookup?
Reverse DNS (rDNS) is the process of resolving an IP address back to a domain name using PTR (pointer) records. It's the opposite of regular DNS lookup.
Why is reverse DNS important for email?
Many email servers perform reverse DNS checks to verify mail server identity. Missing or mismatched rDNS can cause emails to be marked as spam or rejected.
How do I set up reverse DNS?
Reverse DNS must be configured by your IP address provider (hosting company or ISP). Contact them to create PTR records pointing from your IP to your domain.
What if no PTR record exists?
If no PTR record is found, the IP simply doesn't have reverse DNS configured. This is common for residential IPs but should be set up for mail servers.