Since IP addresses are too difficult for most people to remember, web servers are usually referenced by a domain name. This domain name is the text designated to one or more IP addresses. When you type in a domain name in a browser, the browser looks up the IP address associated with that domain name by requesting the IP address from a name server. To find the IP address that corresponds with that domain name you would have to look it up by using the nslookup command. All domain names are unique, therefore domain names must be registered kind of like trademarks. The domain names are organized and grouped by TLD. TLD differs from nations, .us would be for the US and .uk would be for United Kingdom.
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