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.
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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