WHOIS is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system, but is also used for a wider range of other information. The protocol stores and delivers database content in a human-readable format
In Linux, the whois command line utility is a WHOIS client for communicating with the WHOIS server which listen to requests on the well-known port number 43, which stores and delivers database content in a human-readable format.
whois command line utility does not come pre-installed on Centos,Run the below command to install it
yum install whois
How to Find IP Address Information
To get the information about specific IP Address issue the command as shown in the below example.
How to Find Domain Information
To get the information about the registered domain, simply issue the following command with the domain name. It will retrieve domain data including availability, ownership, creation, expiration details, name servers, etc.
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