Reverse DNS (PTR) Lookup
Resolve an IPv4 or IPv6 address back to its associated hostname and domain.
Reverse DNS (PTR) & FCrDNS Verification
Resolve in-addr.arpa pointer records and verify Forward-Confirmed Reverse DNS (FCrDNS) authenticity.
About the Reverse DNS (PTR) Lookup
Reverse DNS looks up the pointer (PTR) record of an IP address to discover the associated hostname. Proper PTR configuration is required for outgoing email deliverability.
How to Use
Enter any IPv4 or IPv6 address to query its PTR record.
Understanding Results
A valid reverse PTR hostname matching your mail server's FQDN is essential to avoid spam filters.
Frequently Asked Questions
Who configures PTR records?
PTR records must be set by the organization that owns the IP address block (usually your cloud host or ISP).
Related DNS & Domains Utilities
Discover physical location, ISP, Autonomous System Number, and network owner.
Query A, AAAA, MX, TXT, CNAME, NS, SOA, and PTR records for any domain.
Audit email authentication records to prevent domain spoofing and phishing.
Test whether network ports (80, 443, 22, 21, 3306, 8080) are open, filtered, or closed.