Port0— Reserved Port
Port réservé ; inutilisé (peut servir de port source si le processus émetteur ne prévoit pas de recevoir de réponse)
Registry assignments, software defaults and local listeners are different things. A port number alone does not identify or secure a service.
Logiciels utilisant ce port (2 logiciels)
Community software entries: links are references, not individual verification.
Reserved Port
Port
TCP/IP Stack
TCP/IPProtocol
Conseils d’utilisation
- Avant d’utiliser le port 0, vérifiez qu’il n’est pas occupé par d’autres services
- En cas de conflit de ports, envisagez d’utiliser d’autres ports ou d’arrêter le service qui occupe le port
Questions fréquentes
What is port 0 used for?
Port 0 sits in the System 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 0 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 0 is in use?
On Linux: sudo ss -tlnp 'sport = :0' for an exact port match. On macOS: sudo lsof -nP -iTCP:0 -sTCP:LISTEN. On Windows PowerShell: Get-NetTCPConnection -LocalPort 0 -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 0 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.
En bref
- Port
- 0
- Protocole
- TCP
- Catégories
- Système
- État d’utilisation
- 2 logiciels utilisant ce port
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