All ports
Port12/TCP
Port
12
Protocol
TCP
Category
Well-Known
Service
Unassigned
What is port 12?
Port 12/TCP is a Well-Known port, assigned by IANA for widely recognized services. It currently has no assigned service in the IANA registry.
Unassigned
Useful commands
nmapnmap -p 12 -sV example.comnetcatnc -zv example.com 12curlcurl -v http://example.com:12/telnettelnet example.com 12bash(echo > /dev/tcp/example.com/12) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 12/tcpDeny
sudo ufw deny 12/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 12 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 12 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=12/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 12" dir=in action=allow protocol=TCP localport=12Security 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- Outdated versions with vulnerabilities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 12/TCP?
Port 12/TCP is associated with the Unassigned service. Unassigned
Is it safe to expose port 12 to the Internet?
It depends on the service and configuration. Port 12 (Unassigned) 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 12 is open?
You can use nmap: `nmap -p 12 -sV example.com`, netcat: `nc -zv example.com 12`, or the bash command: `(echo > /dev/tcp/example.com/12) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 12 on my firewall?
On Linux with UFW: `sudo ufw allow 12/tcp` (open) or `sudo ufw deny 12/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 12 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 12" dir=in action=allow protocol=TCP localport=12`.
What applications and services use port 12?
Port 12/TCP is used by the Unassigned service. Specific uses depend on the software and configuration. Check our related tools section for more information.