Free Reverse IP (PTR) Lookup.
Look up PTR records for any IP address in seconds. Confirm reverse DNS, view TTL values, and troubleshoot email deliverability and trust checks.
Reverse IP Lookup.
How does Reverse IP (PTR) Lookup work?
Enter an IP address (e.g., 8.8.8.8) and click “Check”. Our tool queries reverse DNS for PTR records and returns the hostname associated with that IP—along with TTL (time-to-live)—so you can validate configuration and troubleshoot caching.
What is a PTR record?
A PTR record (Pointer record) is the reverse of an A/AAAA record. Instead of mapping a domain to an IP address, it maps an IP address back to a hostname. PTR records are commonly used in email trust checks and can affect deliverability.
PTR vs A/AAAA (quick clarification)
A/AAAA: Domain → IP address
PTR: IP address → hostname
What is a PTR record?
A PTR record (Pointer record) is the reverse of an A/AAAA record. Instead of mapping a domain to an IP address, it maps an IP address back to a hostname. PTR records are commonly used in email trust checks and can affect deliverability.
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Start monitoring for freeFrequently asked questions.
What’s the difference between a reverse DNS (PTR) lookup and a regular DNS lookup?
Regular DNS maps a hostname to an IP (A/AAAA). Reverse DNS uses a PTR record to map an IP back to a hostname (via the
in-addr.arpanamespace for IPv4).What is FCrDNS (forward-confirmed reverse DNS) and why do email servers care?
FCrDNS means your IP’s PTR resolves to a hostname, and that hostname resolves back to the same IP. Many mail systems treat this as a basic trust signal.
What should my PTR record point to for sending email?
Ideally, your PTR should point to a real, stable hostname (like mail.example.com) whose A/AAAA record points back to the same sending IP.Why does my IP reverse-resolve to a generic ISP/hosting hostname?
Because PTR records are typically controlled by the IP owner (your ISP/host/cloud provider), and many providers default to generic names unless you request a custom rDNS value.
How do I change or set a PTR record?
You usually can’t change it in your domain registrar DNS—PTR is set where the IP is managed (hosting/cloud/ISP control panel or support request).
Can one IP have multiple PTR records?
Technically, yes, but best practice is to keep reverse DNS unambiguous—many systems expect a single “primary” hostname per IP address.
How does reverse DNS work for IPv6?
IPv6 reverse DNS uses ip6.arpa and a “nibble” (hex) reversed format to publish PTR records.
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