Port 22004
optohost004 · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | optohost004 |
| Registered | 2006-09 |
Frequently asked questions
What is port 22004 used for?
Port 22004 is registered with the IANA for optohost004 (TCP/UDP). Description: Opto Host Port 4.
Is port 22004 a well-known port?
No. Port 22004 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 22004 is open?
Locally on Linux with ss -tulpn | grep ':22004\b', on Windows with netstat -ano | findstr :22004. To test a remote host use Test-NetConnection <host> -Port 22004 in PowerShell or nc -zv <host> 22004 on Linux/macOS.
How do I open port 22004 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 22004/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=22004/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 22004" -Direction Inbound -Protocol TCP -LocalPort 22004 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | optohost004 | Opto Host Port 4 |
| UDP | optohost004 | Opto Host Port 4 |