All ports
Port666/TCP
doomPort
666
Protocol
TCP
Category
Well-Known
Service
doom
What is port 666?
Port 666/TCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the doom service.
doom Id Software
Useful commands
nmapnmap -p 666 -sV example.comnetcatnc -zv example.com 666curlcurl -v http://example.com:666/telnettelnet example.com 666bash(echo > /dev/tcp/example.com/666) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 666/tcpDeny
sudo ufw deny 666/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 666 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 666 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=666/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 666" dir=in action=allow protocol=TCP localport=666Security 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- Outdated versions with vulnerabilities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 666/TCP?
Port 666/TCP is associated with the doom service. doom Id Software
Is it safe to expose port 666 to the Internet?
It depends on the service and configuration. Port 666 (doom) 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 666 is open?
You can use nmap: `nmap -p 666 -sV example.com`, netcat: `nc -zv example.com 666`, or the bash command: `(echo > /dev/tcp/example.com/666) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 666 on my firewall?
On Linux with UFW: `sudo ufw allow 666/tcp` (open) or `sudo ufw deny 666/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 666 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 666" dir=in action=allow protocol=TCP localport=666`.
What applications and services use port 666?
Port 666/TCP is used by the doom service. Specific uses depend on the software and configuration. Check our related tools section for more information.