Port 3306 — MySQL / MariaDB
Quick reference for TCP/UDP port 3306, used by MySQL / MariaDB. Includes what the service does, security guidance and related ports.
What is port 3306?
MySQL and MariaDB database.
What port does MySQL / MariaDB use?
MySQL / MariaDB listens on port 3306 by default.
Is port 3306 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 3306
Test-NetConnection HOST -Port 3306
nmap -p 3306 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
High risk — do not expose to the internet
Port 3306 (MySQL / MariaDB) is high-risk because the service it carries is a frequent target for credential attacks, brute force or unpatched-vulnerability scanning. Keep it bound to localhost or your VPN, never forward it directly on a router, and require strong authentication.
Related ports
Frequently asked
What is port 3306 used for?+
Port 3306 is the standard TCP/UDP port for MySQL / MariaDB. MySQL and MariaDB database.
What port does MySQL / MariaDB use?+
MySQL / MariaDB listens on port 3306 by default.
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