Whois is a service that provides basic information about a registered domain, such as 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. ICANN regulations require all domain registrants to keep their contact details valid and up-to-date to help prevent fraud and identity theft.
Domain registrars usually allow their customers to change their domain contact information directly from their accounts. Updates to Whois information may take up to 24 hours.
Some domain registries allow domain owners to hide certain details in their public Whois records. They do this by replacing the registrant's data with the one of the Registrar or hosting company. This feature is called Whois Privacy Protection, or domain privacy. For example, in a user's public Whois record with domain protection, their personal email is substituted with a string that looks like firstname.lastname@example.org
Anyone wishing to contact the user would send email to this address, which would be privately redirected to the user's personal email.