host command in Linux system is used for DNS (Domain Name System) lookup operations. In simple words, this command is used to find the IP address of a particular domain name or if you want to find out the domain name of a particular IP address the host command becomes handy. You can also find more specific details of a domain by specifying the corresponding option along with the domain name.
host [-aCdlriTWV] [-c class] [-N ndots] [-t type] [-W time]
[-R number] [-m flag] hostname [server]
host command without any option: It will print the general syntax of the command along with the various options that can be used with the host command as well as gives a brief description about each option.
Different options with the host command:
- host domain_name: This will print the IP address details of the specified domain.
- host IP_Address: This will display the domain details of the specified IP Address.
- -a or -v: It used to specify the query type or enables the verbose output.
Example:C++12345host -a geeksforgeeks.org
- -t : It is used to specify the type of query.
Example 1:C++12345host -t ns geeksforgeeks.org
Example 2: To print SOA recordC++12345host -t SOA geeksforgeeks.org
Example 3: To print txt recordC++12345host -t txt geeksforgeeks.org
- -C : In order to compare the SOA records on authoritative nameservers.
Example:C++12345host -C geeksforgeeks.org
- -R : In order to specify the number of retries you can do in case one try fails. If anyone try succeeds then the command stops.
Example:C++12345host -R 3 geeksforgeeks.org
- -l :In order to list all hosts in a domain.For this command to work you need to be either an admin or a node server.
Example:C++12345host -l geeksforgeeks.org
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