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Network Server

Reverse DNS Lookup

Find the hostname behind an IP address.

Query

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Questions
Why does an IP have no PTR record?
Reverse DNS is controlled by whoever holds the address block, usually the hosting provider or ISP, not by the domain owner. Many providers set nothing by default. Absence of a PTR is common and is not in itself a sign of anything wrong.
Why does my mail keep getting rejected?
A missing or non-forward-confirmed PTR is one of the most common causes. Receiving servers check that the sending IP has a PTR, and that the hostname it names resolves back to that IP. Ask your provider to set the PTR to a hostname you control, then publish a matching A record.
        
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