#Dns forward and reverse lookup how to#
In this article, we have looked at how to do reverse DNS lookup in Linux using host, nslookup and dig commands. Here is how you can do a reverse lookup using nslookup command as shown below. In non-interactive mode, it displays standard information such as name and some more commonly required details. In interactive mode, it will display requested information about hosts & domains, that you enquired in your query. It has two modes – interactive and non-interactive mode. Nslookup is a network administrative tool that is generally used to diagnose network issues. The Got answer section will show the domain name associated with a given IP address. It gives a lot more information that just Here is how to use dig command to do reverse lookup. 54.43.32.21.in-addr.arpa domain name pointer ĭig is another popular command used by system administrators. You will get an output like the following. Here is how to get domain name associated with an IP address say 54.43.32.21 $ host 54.43.32.21 Host command is a Linux utility that can be used for DNS Lookup as well as Reverse DNS Lookup. These commands are already pre-installed in every Linux distribution and do not require separate installation or configuration. You can use nslookup, dig or host command to do reverse DNS lookup in Linux. It is also used to map IP addresses to domains in log files, so that there is a human readable value, instead of numeric IP addresses, making it easy to understand information. It need not work all the time because every IP address need not have a domain associated with it. It is mostly used by email servers to identify and block spam mails. Reverse DNS lookup is used to find out the domain name associated with an given IP address. In this case, we find out which domains point to a given IP address. Reverse DNS Lookup is the process of resolving an IP address to a domain name. It is also known as forward DNS and takes place every time you visit a website. You can use these steps in all Linux systems as they are universally available commands.ĭNS Lookup is basically the process of resolving domain to an IP address. In this article, we will look at how to reverse DNS lookup in Linux. Sometimes you may need to do reverse DNS lookup in Linux.
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