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Online Whois Checker allows you to trace the ownership and tenure of a domain name. Similar to how all houses are registered with a governing authority, all domain name registries maintain a record of information about every domain name purchased through them, along with who owns it, and the date till which it has been purchased.
An IP is a unique address of a server on the internet. Similar to how a telephone number allows you to connect to a specific phone on the telecom network, similarly, an IP address allows your computer to connect to a specific server on the internet.
Domain names and IP numbers are the framework upon which the entire world wide web is built.
IP numbers are assigned to networking organisations with a record maintained by governing bodies for each IP number and the organisation to which it has been assigned. A whois IP lookup allows you track the above mentioned details for a domain.