Reverse DNS (PTR) Lookup
Find the hostname associated with any IP address via PTR records.
What is Reverse DNS (PTR) Lookup?
Forward DNS maps hostnames to IPs (example.com → 1.2.3.4). Reverse DNS does the opposite: it asks 'what hostname owns this IP?' via PTR records. Critical for email deliverability — mail servers without PTR records are usually rejected by major providers (Gmail, Microsoft) as suspected spam sources.
Frequently asked questions
Why does Gmail require PTR records?▼
PTR records prove the IP's owner controls the reverse DNS zone — a signal that the sender is a legitimate operator, not a botnet.
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