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Definition

Port Number

A port number is a numerical identifier used to distinguish a specific program, application, or service running on a networked device. When combined with an IP address—which locates the device itself—the port number directs incoming data to the precise destination software, such as web servers listening on port 80 for HTTP or port 443 for HTTPS.

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Updated 2026-09-09

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Prep Sessions

The Architecture of Connected Systems: Tracing End-to-End Data Flow @ University of Michigan - Ann Arbor

Ch.2 Addressing and Identification - The Architecture of Connected Systems: Tracing End-to-End Data Flow @ University of Michigan - Ann Arbor

Port Numbers and Service Identification - The Architecture of Connected Systems: Tracing End-to-End Data Flow @ University of Michigan - Ann Arbor

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