Hostname refers to the unique name that identifies a computer or other device on a network.

On the Internet, the host name is in the form ""; if there is only one Internet site the host name is the same as the domain name. One computer can have more than one host name if it hosts more than one Internet site, however (for example, "" and ""); in that case "desk" and "room" are host names and "" is the domain name.

Each machine connected to the Internet has an address known as an Internet Protocol address (IP address). The IP address takes the form of four numbers separated by dots, for example:

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