Find Reverse-DNS/PTR using dig, nslookup, host
Reverse-DNS/PTR is used by mail servers. It is used to map an IP address to FQDN or hostname.
To find Reverse DNS record for an IP address, run
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nslookup IP_ADDR_HERE |
In this example IP 51.38.246.115 have a Reverse DNS record ok.serverok.in
Using dig
You can also use dig command to find PTR record for an IP address.
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dig -x IP_ADDR_HERE dig +short -x IP_ADDR_HERE |
Using host
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host IP_ADDR_HERE |
See DNS