Port 22003
optohost003 · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | optohost003 |
| Registered | 2006-09 |
Frequently asked questions
What is port 22003 used for?
Port 22003 is registered with the IANA for optohost003 (TCP/UDP). Description: Opto Host Port 3.
Is port 22003 a well-known port?
No. Port 22003 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 22003 is open?
Locally on Linux with ss -tulpn | grep ':22003\b', on Windows with netstat -ano | findstr :22003. To test a remote host use Test-NetConnection <host> -Port 22003 in PowerShell or nc -zv <host> 22003 on Linux/macOS.
How do I open port 22003 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 22003/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=22003/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 22003" -Direction Inbound -Protocol TCP -LocalPort 22003 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | optohost003 | Opto Host Port 3 |
| UDP | optohost003 | Opto Host Port 3 |