All ports
Port406/TCP
imspPort
406
Protocol
TCP
Category
Well-Known
Service
imsp
What is port 406?
Port 406/TCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the imsp service.
Interactive Mail Support Protocol
Useful commands
nmapnmap -p 406 -sV example.comnetcatnc -zv example.com 406curlcurl -v http://example.com:406/telnettelnet example.com 406bash(echo > /dev/tcp/example.com/406) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 406/tcpDeny
sudo ufw deny 406/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 406 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 406 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=406/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 406" dir=in action=allow protocol=TCP localport=406Security 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- Outdated versions with vulnerabilities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 406/TCP?
Port 406/TCP is associated with the imsp service. Interactive Mail Support Protocol
Is it safe to expose port 406 to the Internet?
It depends on the service and configuration. Port 406 (imsp) 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 406 is open?
You can use nmap: `nmap -p 406 -sV example.com`, netcat: `nc -zv example.com 406`, or the bash command: `(echo > /dev/tcp/example.com/406) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 406 on my firewall?
On Linux with UFW: `sudo ufw allow 406/tcp` (open) or `sudo ufw deny 406/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 406 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 406" dir=in action=allow protocol=TCP localport=406`.
What applications and services use port 406?
Port 406/TCP is used by the imsp service. Specific uses depend on the software and configuration. Check our related tools section for more information.