# WHATPORT(4200)

## NAME

port 4200 — Angular CLI dev server — The default port for `ng serve`, the Angular development server.

Protocol: TCP

## DESCRIPTION

Angular CLI's serve builder defaults to port 4200, so any machine doing Angular frontend work has one. IANA assigns the 4200-4299 range to vrml-multi-use, which you will not encounter. A 4200 on a scan is a developer workstation or a container that shipped a dev build instead of a production bundle.

## EXPOSURE

**Do not expose.** It is an unauthenticated dev server with a live-reload websocket and unminified sources — keep it on localhost.

## CHECK

```sh
curl -s http://localhost:4200/ | head -20
```

## SEE ALSO

- docs — [Angular CLI — ng serve (port default 4200)](https://angular.dev/cli/serve) (angular.dev)
- source — [angular/angular-cli on GitHub](https://github.com/angular/angular-cli) (github.com)

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HTML: <https://whatport.net/4200/> · JSON: <https://whatport.net/4200.json> · full dataset: <https://whatport.net/ports.json>