Vite's default development server port.
Vite picks 5173 for vite dev unless server.port says otherwise, and it walks upward (5174, 5175) when the port is taken. Anything built on Vite — modern React, Vue, Svelte and SvelteKit setups — lands here. It is unregistered with IANA, so a listener on 5173 is a frontend developer's machine or a container running a dev build.
Do not expose
A dev server with hot-module reload, source maps and no auth has no business on a public interface.
$ curl -sI http://localhost:5173/Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.