Port 16003
alfin · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | alfin |
| Registered | 2010-10-06 |
Frequently asked questions
What is port 16003 used for?
Port 16003 is registered with the IANA for alfin (TCP/UDP). Description: Reserved; Automation and Control by REGULACE.ORG.
Is port 16003 a well-known port?
No. Port 16003 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 16003 is open?
Locally on Linux with ss -tulpn | grep ':16003\b', on Windows with netstat -ano | findstr :16003. To test a remote host use Test-NetConnection <host> -Port 16003 in PowerShell or nc -zv <host> 16003 on Linux/macOS.
How do I open port 16003 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 16003/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=16003/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 16003" -Direction Inbound -Protocol TCP -LocalPort 16003 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | – | Reserved |
| UDP | alfin | Automation and Control by REGULACE.ORG |