All ports
Port3889/TCP
dandv-testerPort
3889
Protocol
TCP
Category
Registered
Service
dandv-tester
What is port 3889?
Port 3889/TCP is a Registered port, registered with IANA for specific applications. It is associated with the dandv-tester service.
D and V Tester Control Port
Useful commands
nmapnmap -p 3889 -sV example.comnetcatnc -zv example.com 3889curlcurl -v http://example.com:3889/telnettelnet example.com 3889bash(echo > /dev/tcp/example.com/3889) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 3889/tcpDeny
sudo ufw deny 3889/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 3889 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 3889 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=3889/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 3889" dir=in action=allow protocol=TCP localport=3889Security 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- Outdated versions with vulnerabilities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 3889/TCP?
Port 3889/TCP is associated with the dandv-tester service. D and V Tester Control Port
Is it safe to expose port 3889 to the Internet?
It depends on the service and configuration. Port 3889 (dandv-tester) 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 3889 is open?
You can use nmap: `nmap -p 3889 -sV example.com`, netcat: `nc -zv example.com 3889`, or the bash command: `(echo > /dev/tcp/example.com/3889) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 3889 on my firewall?
On Linux with UFW: `sudo ufw allow 3889/tcp` (open) or `sudo ufw deny 3889/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 3889 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 3889" dir=in action=allow protocol=TCP localport=3889`.
What applications and services use port 3889?
Port 3889/TCP is used by the dandv-tester service. Specific uses depend on the software and configuration. Check our related tools section for more information.