DNS - rDNS - Reverse DNS (lookup|resolution) - from IP to name

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A reverse dns lookup is a dns lookup that get the DNS name (known also as the reverse DNS name) from the IP address

The inverse is called a forward dns lookup

The reverse DNS database of the Internet is rooted in the .arpa top-level domain.

This is not the physical hostname but the name known in the name service (DNS) The hostname has no relation to the ip.



You need to query the name service.


NSLOOKUP. Example from googlebot

Name:    crawl-66-249-66-1.googlebot.com


Ping which will try to use WINS and DNS

ping -a
Pinging gerardnico01.gerardnico.local [] with 32 bytes of d

Reply from bytes=32 time<1ms TTL=64
Reply from bytes=32 time<1ms TTL=64
Reply from bytes=32 time<1ms TTL=64
Reply from bytes=32 time<1ms TTL=64

Ping statistics for
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms


host ip



PTR record

A PTR record creates the reverse entry.

Documentation / Reference

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