Port 5991
nuxsl · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | nuxsl |
| Registered | 2002-03 |
Frequently asked questions
What is port 5991 used for?
Port 5991 is registered with the IANA for nuxsl (TCP/UDP). Description: NUXSL.
Is port 5991 a well-known port?
No. Port 5991 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 5991 is open?
Locally on Linux with ss -tulpn | grep ':5991\b', on Windows with netstat -ano | findstr :5991. To test a remote host use Test-NetConnection <host> -Port 5991 in PowerShell or nc -zv <host> 5991 on Linux/macOS.
How do I open port 5991 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 5991/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=5991/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 5991" -Direction Inbound -Protocol TCP -LocalPort 5991 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | nuxsl | NUXSL |
| UDP | nuxsl | NUXSL |