Network Ports Explained: How Servers Know Which Application Should Handle a Request
This story is from 2026-10-06. It is preserved in the archive; the latest stories are on the live feed.
If you're learning backend development, you've probably seen things like: localhost:3000 localhost:5000 :80 :443 At first, the port number can seem like just another configuration value. But why does a server need a port when it already has an IP address? If one server is running a Node.js API, Pos…
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- 2026-10-06 19:51 · DEV Community — AI
Network Ports Explained: How Servers Know Which Application Should Handle a Request