Puerto3000— Next.js / development HTTP
La CLI de Next.js usa el puerto 3000 de forma predeterminada. Otros servidores de desarrollo también pueden usarlo, pero Node.js y React no imponen un puerto de escucha universal.
Registry assignments, software defaults and local listeners are different things. A port number alone does not identify or secure a service.
Configuration and troubleshooting
En Next.js, next dev --port 3002 --hostname 127.0.0.1 selecciona un punto de conexión local. Si usa un script npm, asegúrese de que los argumentos lleguen al comando subyacente.
Important limitations
3002 es un ejemplo, no un puerto garantizado como libre. No exponga un servidor de desarrollo como servicio de producción; actualice las direcciones de callback y los destinos del proxy tras los cambios.
Read-only checks: run on the server host
Choose the commands for your OS. Check TCP and UDP separately. No result is not a lasting availability guarantee; inspect host and container separately.
Linux
sudo ss -ltnp 'sport = :3000'macOS
sudo lsof -nP -iTCP:3000 -sTCP:LISTENWindows PowerShell
Get-NetTCPConnection -LocalPort 3000 -State ListenSources and review
Sources checked on:
This review covers the explanations and sources on this page, not your device or every community software entry below.
Software que utiliza este puerto (29 programas)
Community software entries: links are references, not individual verification.
Node.js Development Server
Node.js is a runtime; the application chooses its listening port.
React Development Server
A React application uses the development port configured by its build tool or framework.
Recomendaciones de uso
- Antes de utilizar el puerto 3000, comprueba que no esté ocupado por otros servicios
- Si encuentras conflictos de puertos, considera utilizar otros puertos o detener el servicio que lo ocupa
Preguntas frecuentes
What is port 3000 used for?
Port 3000 sits in the Development category. This page lists the registered purpose and the software commonly associated with it; to see what is actually listening on a specific machine, check the process with ss/netstat.
Is port 3000 TCP or UDP?
The registered protocol on this page is TCP. The same number behaves independently on each protocol: TCP may be listening while UDP is idle, so check them separately.
How do I check if port 3000 is in use?
On Linux: sudo ss -tlnp 'sport = :3000' for an exact port match. On macOS: sudo lsof -nP -iTCP:3000 -sTCP:LISTEN. On Windows PowerShell: Get-NetTCPConnection -LocalPort 3000 -State Listen. A listener counts as confirmed only when you can see the bind address and process name; without root/admin you will not see other users' processes.
Is port 3000 secure? Should I open it in my firewall?
A port number has no inherent security — it depends on whether the listening service is correctly configured and whether it needs exposure at all. Keep loopback/internal-only services firewalled; where public access is required, pair it with source restrictions, VPN or authentication. The caution section on this page lists port-specific risks.
Información rápida
- Puerto
- 3000
- Protocolo
- TCP
- Categorías
- Desarrollo
- Estado de uso
- 29 programas que lo utilizan
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