Port 542
commerce · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | commerce |
Frequently asked questions
What is port 542 used for?
Port 542 is registered with the IANA for commerce (TCP/UDP). Description: commerce.
Is port 542 a well-known port?
Yes. Port 542 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 542 is open?
Locally on Linux with ss -tulpn | grep ':542\b', on Windows with netstat -ano | findstr :542. To test a remote host use Test-NetConnection <host> -Port 542 in PowerShell or nc -zv <host> 542 on Linux/macOS.
How do I open port 542 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 542/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=542/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 542" -Direction Inbound -Protocol TCP -LocalPort 542 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | commerce | commerce |
| UDP | commerce | commerce |