According to Wikipedia, WHOIS (pronounced as the phrase who is) is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource.

This resource has domain owner contact information, domain availability status and the company with which the domain is registered (also called the Registrar). Whois also provides registration and expiration dates of a domain as well as the nameservers the domain is using.

In this post, we will use the whois service provided by mxtoolbox.

Simply just enter the target’s domain or URL into the provided tab. This time, we want to know who is the registrar of pentest.id.

The result is out. This information can be used for social engineering the target to gain access by acting as the host admin and tell the registrar that there is some problem with the registered domain.

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