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TCP Port

A 16-bit number that, with the IP address, identifies a specific connection endpoint, letting one host multiplex many services and connections. Servers listen on well-known ports; clients bind ephemeral ones; only one listener may own a given address:port pair.

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How TCP Port Numbers Multiplex Connections Above the IP Layer in Computer Networking

TCP port numbers constitute a second level of addressing layered above IP addressing, resolving the fact that an IP address names only a host and therefore cannot distinguish among the multiple servi…