Reverse DNS Lookup
Find domain name from IP address
What is Reverse DNS?
Reverse DNS (rDNS) maps an IP address back to a domain name using PTR records. It helps verify server identity and is commonly used by email providers, security tools, and network administrators.
Our Reverse DNS Lookup tool checks PTR records instantly, so you can confirm if an IP address is properly mapped to a hostname.
Why Reverse DNS Matters
📧 Email Deliverability
Many email servers require rDNS to reduce spam and improve trust.
🛡️ Security Verification
Validate that an IP belongs to the expected domain or organization.
🧭 Network Troubleshooting
Identify misconfigured DNS and track services across IP ranges.
🔍 Reputation Checks
Confirm hostnames when auditing logs or reviewing traffic sources.
Common rDNS Issues
Missing PTR Record
Your IP has no reverse DNS entry, which can affect email delivery.
Hostname Mismatch
PTR record points to a hostname that doesn’t match your domain.
Stale DNS
Old PTR records remain after IP changes or migrations.
How to Fix Reverse DNS
✅ Contact Your Hosting Provider
PTR records are usually managed by the IP owner (hosting or ISP).
✅ Use Valid Hostnames
Ensure the PTR hostname resolves forward to the same IP (FCrDNS).
✅ Keep Records Updated
Update rDNS when migrating servers or changing providers.
✅ Re-test After Changes
DNS propagation can take time—check again after updates.