Port 243
sur-meas · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | sur-meas |
Frequently asked questions
What is port 243 used for?
Port 243 is registered with the IANA for sur-meas (TCP/UDP). Description: Survey Measurement.
Is port 243 a well-known port?
Yes. Port 243 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 243 is open?
Locally on Linux with ss -tulpn | grep ':243\b', on Windows with netstat -ano | findstr :243. To test a remote host use Test-NetConnection <host> -Port 243 in PowerShell or nc -zv <host> 243 on Linux/macOS.
How do I open port 243 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 243/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=243/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 243" -Direction Inbound -Protocol TCP -LocalPort 243 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | sur-meas | Survey Measurement |
| UDP | sur-meas | Survey Measurement |