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

1 - About

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.

3 - Management

3.1 - Get

You need to query the name service.

3.1.1 - Nslookup

NSLOOKUP. Example from googlebot


nslookup 66.249.66.1


Name:    crawl-66-249-66-1.googlebot.com
Address:  66.249.66.1

3.1.2 - Ping

Ping which will try to use WINS and DNS


ping -a 192.168.10.241


Pinging gerardnico01.gerardnico.local [192.168.10.241] with 32 bytes of d
ata:

Reply from 192.168.10.241: bytes=32 time<1ms TTL=64
Reply from 192.168.10.241: bytes=32 time<1ms TTL=64
Reply from 192.168.10.241: bytes=32 time<1ms TTL=64
Reply from 192.168.10.241: bytes=32 time<1ms TTL=64

Ping statistics for 192.168.10.241:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

3.1.3 - host


host ip

3.1.4 - dig

3.2 - Set

3.2.1 - PTR record

A PTR record creates the reverse entry.

4 - Documentation / Reference


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