All ports
Port12003/UDP
entextmedPort
12003
Protocol
UDP
Category
Registered
Service
entextmed
What is port 12003?
Port 12003/UDP is a Registered port, registered with IANA for specific applications. It is associated with the entextmed service.
IBM Enterprise Extender SNA COS Medium Priority
Useful commands
nmapnmap -p 12003 -sV example.comnetcatnc -zv example.com 12003curlcurl -v http://example.com:12003/telnettelnet example.com 12003bash(echo > /dev/udp/example.com/12003) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 12003/udpDeny
sudo ufw deny 12003/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 12003 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 12003 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=12003/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 12003" dir=in action=allow protocol=UDP localport=12003Security 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- Outdated versions with vulnerabilities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 12003/UDP?
Port 12003/UDP is associated with the entextmed service. IBM Enterprise Extender SNA COS Medium Priority
Is it safe to expose port 12003 to the Internet?
It depends on the service and configuration. Port 12003 (entextmed) is a Registered 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 12003 is open?
You can use nmap: `nmap -p 12003 -sV example.com`, netcat: `nc -zv example.com 12003`, or the bash command: `(echo > /dev/udp/example.com/12003) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 12003 on my firewall?
On Linux with UFW: `sudo ufw allow 12003/udp` (open) or `sudo ufw deny 12003/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 12003 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 12003" dir=in action=allow protocol=UDP localport=12003`.
What applications and services use port 12003?
Port 12003/UDP is used by the entextmed service. Specific uses depend on the software and configuration. Check our related tools section for more information.