WHOIS is an Internet service that allows users to query domain name registries to retrieve information about registered domain names. It includes data such as:

Registrant’s name and contact information

Domain creation and expiration dates

Registrar details and name servers

WHOIS is often used during the reconnaissance phase in penetration testing.

Reference – CEH v13 Official Study Guide:

Module 2: Footprinting and Reconnaissance

Quote:

“WHOIS databases provide public domain registration details including contact names, email addresses, and registrar information. This is useful for initial reconnaissance.”

Incorrect Options:

B. CAPTCHA is used to distinguish human users from bots.

C. IANA oversees global IP address allocation and DNS root zone management.

D. IETF is responsible for internet standards, not registrant databases.

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