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Whois is an Internet service and protocol that searches and displays information pertaining to a domain name from repositories of domain name registrars worldwide.
Whois service is a free Internet service that enables a user to search a specific domain name's availability and, in the case that it's registered, the assigned entity/person to whom it is registered. Whois was first conceived in 1982 as an enhancement to the Nickname protocol that was developed by ARPANET.