Port 1903
linkname · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | linkname |
Frequently asked questions
What is port 1903 used for?
Port 1903 is registered with the IANA for linkname (TCP/UDP). Description: Local Link Name Resolution.
Is port 1903 a well-known port?
No. Port 1903 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 1903 is open?
Locally on Linux with ss -tulpn | grep ':1903\b', on Windows with netstat -ano | findstr :1903. To test a remote host use Test-NetConnection <host> -Port 1903 in PowerShell or nc -zv <host> 1903 on Linux/macOS.
How do I open port 1903 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 1903/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=1903/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 1903" -Direction Inbound -Protocol TCP -LocalPort 1903 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | linkname | Local Link Name Resolution |
| UDP | linkname | Local Link Name Resolution |