Port 12003
entextmed · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | entextmed |
Frequently asked questions
What is port 12003 used for?
Port 12003 is registered with the IANA for entextmed (TCP/UDP). Description: IBM Enterprise Extender SNA COS Medium Priority.
Is port 12003 a well-known port?
No. Port 12003 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 12003 is open?
Locally on Linux with ss -tulpn | grep ':12003\b', on Windows with netstat -ano | findstr :12003. To test a remote host use Test-NetConnection <host> -Port 12003 in PowerShell or nc -zv <host> 12003 on Linux/macOS.
How do I open port 12003 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 12003/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=12003/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 12003" -Direction Inbound -Protocol TCP -LocalPort 12003 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | entextmed | IBM Enterprise Extender SNA COS Medium Priority |
| UDP | entextmed | IBM Enterprise Extender SNA COS Medium Priority |