Port 165
xns-courier · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | xns-courier |
Frequently asked questions
What is port 165 used for?
Port 165 is registered with the IANA for xns-courier (TCP/UDP). Description: Xerox.
Is port 165 a well-known port?
Yes. Port 165 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 165 is open?
Locally on Linux with ss -tulpn | grep ':165\b', on Windows with netstat -ano | findstr :165. To test a remote host use Test-NetConnection <host> -Port 165 in PowerShell or nc -zv <host> 165 on Linux/macOS.
How do I open port 165 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 165/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=165/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 165" -Direction Inbound -Protocol TCP -LocalPort 165 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | xns-courier | Xerox |
| UDP | xns-courier | Xerox |