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Port101— NIC Name Server

TCPSystème

Port du service de noms d’hôte pour la résolution des noms d’hôte réseau

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.

NIC Name Server

NetworkServer

Legacy Name Services

Service

Conseils d’utilisation

  • Avant d’utiliser le port 101, 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 101 used for?

Port 101 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 101 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 101 is in use?

On Linux: sudo ss -tlnp 'sport = :101' for an exact port match. On macOS: sudo lsof -nP -iTCP:101 -sTCP:LISTEN. On Windows PowerShell: Get-NetTCPConnection -LocalPort 101 -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 101 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
101
Protocole
TCP
Catégories
Système
État d’utilisation
2 logiciels utilisant ce port

Ports associés

Port 0TCP
Port 1TCP
Port 5TCP

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