All ports
Port131/UDP
cisco-tnaPort
131
Protocol
UDP
Category
Well-Known
Service
cisco-tna
What is port 131?
Port 131/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the cisco-tna service.
cisco TNATIVE
Useful commands
nmapnmap -p 131 -sV example.comnetcatnc -zv example.com 131curlcurl -v http://example.com:131/telnettelnet example.com 131bash(echo > /dev/udp/example.com/131) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 131/udpDeny
sudo ufw deny 131/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 131 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 131 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=131/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 131" dir=in action=allow protocol=UDP localport=131Security Risks
- Unauthorized access to the service
- Data exposure if the service is unauthenticated
- Outdated versions with vulnerabilities
- Incorrect service configuration
Frequently Asked Questions
What service runs on port 131/UDP?
Port 131/UDP is associated with the cisco-tna service. cisco TNATIVE
Is it safe to expose port 131 to the Internet?
It depends on the service and configuration. Port 131 (cisco-tna) is a Well-Known port. If you need to expose it, keep the service updated, use strong authentication, and configure a firewall. It's always recommended to restrict access by IP when possible.
How do I check if port 131 is open?
You can use nmap: `nmap -p 131 -sV example.com`, netcat: `nc -zv example.com 131`, or the bash command: `(echo > /dev/udp/example.com/131) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 131 on my firewall?
On Linux with UFW: `sudo ufw allow 131/udp` (open) or `sudo ufw deny 131/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 131 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 131" dir=in action=allow protocol=UDP localport=131`.
What applications and services use port 131?
Port 131/UDP is used by the cisco-tna service. Specific uses depend on the software and configuration. Check our related tools section for more information.