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Whois Lookup is a query/response protocol that is extensively utilized for querying databases so as to find out the registrant or assignee of Internet resources, such as a domain name, an IP address block, or an autonomous system number. Simply saying, Whois Lookup is an Internet service that finds information about a domain name or IP address.

Whois Lookup is conventionally carried out with a command line interface application, and network administrators primarily still use this technique, although a lot of easy web-based tools exist. Whois Lookup services are in general communicated via the Transmission Control Protocol i.e., TCP. Servers pay attention to requests on the well-known port number 43.

If you enter a domain name in a Whois Lookup Tool, it will search a massive database of domains and return information regarding the one you entered. This information usually encloses the name, address, and phone number of the administrative, billing, and technical contacts of the domain name.

Whois Lookup can be used to simply check if a certain domain name is available or if it has already been registered. If you enter a domain name you are considering and the search result is "No match," the domain name is likely to be available and you can apply to register it. Most Top Level Domain registries keep up their own Whois Lookup database containing domain name contact information.

Whois Lookup is a tool that will let you know the owner of any second-level domain name who has registered it. If a Web site obtained its domain name from an Internet Service Provider, you can look up the name of the owner of the Web site by entering its domain name. And Whois Lookup will tell you the owner of that second-level domain name.