Port 9991
osm-oev · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | osm-oev |
| Registered | 2003-08 |
Frequently asked questions
What is port 9991 used for?
Port 9991 is registered with the IANA for osm-oev (TCP/UDP). Description: OSM Event Server.
Is port 9991 a well-known port?
No. Port 9991 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 9991 is open?
Locally on Linux with ss -tulpn | grep ':9991\b', on Windows with netstat -ano | findstr :9991. To test a remote host use Test-NetConnection <host> -Port 9991 in PowerShell or nc -zv <host> 9991 on Linux/macOS.
How do I open port 9991 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 9991/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=9991/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 9991" -Direction Inbound -Protocol TCP -LocalPort 9991 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | osm-oev | OSM Event Server |
| UDP | osm-oev | OSM Event Server |