All ports
Port3306/UDP
mysqlPort
3306
Protocol
UDP
Category
Registered
Service
mysql
What is port 3306?
Port 3306/UDP is a Registered port, registered with IANA for specific applications. It is associated with the mysql service.
MySQL
Useful commands
nmapnmap -p 3306 -sV example.comnetcatnc -zv example.com 3306curlcurl -v http://example.com:3306/telnettelnet example.com 3306bash(echo > /dev/udp/example.com/3306) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 3306/udpDeny
sudo ufw deny 3306/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 3306 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 3306 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=3306/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 3306" dir=in action=allow protocol=UDP localport=3306Security Risks
- Unauthorized database access
- SQL injection from connected applications
- Exposure of stored sensitive data
- Privilege escalation through weak configurations
Frequently Asked Questions
What service runs on port 3306/UDP?
Port 3306/UDP is associated with the mysql service. MySQL
Is it safe to expose port 3306 to the Internet?
It depends on the service and configuration. Port 3306 (mysql) 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 3306 is open?
You can use nmap: `nmap -p 3306 -sV example.com`, netcat: `nc -zv example.com 3306`, or the bash command: `(echo > /dev/udp/example.com/3306) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 3306 on my firewall?
On Linux with UFW: `sudo ufw allow 3306/udp` (open) or `sudo ufw deny 3306/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 3306 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 3306" dir=in action=allow protocol=UDP localport=3306`.
What applications and services use port 3306?
Port 3306/UDP is used by the mysql service. Specific uses depend on the software and configuration. Check our related tools section for more information.