Port 131
cisco-tna · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | cisco-tna |
Frequently asked questions
What is port 131 used for?
Port 131 is registered with the IANA for cisco-tna (TCP/UDP). Description: cisco TNATIVE.
Is port 131 a well-known port?
Yes. Port 131 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 131 is open?
Locally on Linux with ss -tulpn | grep ':131\b', on Windows with netstat -ano | findstr :131. To test a remote host use Test-NetConnection <host> -Port 131 in PowerShell or nc -zv <host> 131 on Linux/macOS.
How do I open port 131 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 131/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=131/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 131" -Direction Inbound -Protocol TCP -LocalPort 131 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | cisco-tna | cisco TNATIVE |
| UDP | cisco-tna | cisco TNATIVE |