What is the difference between an IP address and a port number?Īn IP address identifies a machine in an IP network and is used to determine the destination of a data packet. Once known as socket numbers, the early incarnation of port numbers is similar to the Internet Protocol ( IP) address class used today. Hypertext Transfer Protocol ( HTTP) messages, for example, always go to port 80 - one of the most commonly used ports.ĭevelopers of the Advanced Research Projects Agency Network, an informal cooperation of system administrators and software authors, proposed the concept of port numbers. These numbers are reserved for certain protocols and their associated function. All network-connected devices come equipped with standardized ports that have an assigned number.
A port number is a way to identify a specific process to which an internet or other network message is to be forwarded when it arrives at a server.
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