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Reverse DNS Lookup

Find the hostname behind any IP address via its PTR record.

No PTR record (404) is normal — many IPs simply have none.

How to read the result

Reverse DNS queries the special in-addr.arpa / ip6.arpa zones for a PTR record. Mail servers check it for spam filtering. Many IPs (especially client and cloud ranges) have no PTR — that 404 is a normal answer, not an error.

Example

8.8.8.8 → dns.google

FAQ

No PTR record — broken?

No. Only the IP owner can set PTR, and most IPs have none. That is normal.

Why does reverse matter for email?

Receiving servers may reject mail from IPs without matching forward/reverse DNS.

IPv6 supported?

Yes. Enter any IPv4 or IPv6 address.