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TCP/IP Guide by Charles M. Kozierok

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TCP/IP DNS Registry Database Lookup Utility (whois/nicname)

Utilities such as nslookup and host allow administrators to resolve a DNS domain name to an address and also view detailed information about a domain's resource records. There are cases, however, where administrators need to know its DNS registration information, rather technical information about a domain. This includes details such as which organization owns the domain, when its registration expires, and who are the designated contacts who manage it.

In the early days of DNS, all domain names were centrally registered by a single authority, called the Internet Network Information Center (InterNIC or just NIC). To allow Internet users to look up information about domains and contacts, ...

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