Internet-Security.com TCP port 3306 details

TCP port 3306 is the default port for the MySQL Client/Server Protocol used by Oracle MySQL Server (Community and Enterprise editions).
MariaDB Server and Percona Server for MySQL also listen on 3306 by default.
Managed services expose MySQL-compatible endpoints on 3306, including Amazon RDS for MySQL, Amazon Aurora MySQL, Google Cloud SQL for MySQL, and Azure Database for MySQL.
Client tools and drivers connect over 3306, such as MySQL Workbench, the mysql CLI, phpMyAdmin (via the PHP MySQL driver), and MySQL Connector/J (JDBC) and Connector/ODBC.
Applications commonly using it for database backends include WordPress, Drupal, Magento, MediaWiki, and Moodle when pointed to a remote MySQL/MariaDB host.
Traditional MySQL replication uses port 3306 for the replica I/O thread to connect to the primary unless configured otherwise.
Developer stacks like XAMPP, WAMP, and MAMP ship MySQL/MariaDB on 3306 by default.
Security note: Port 3306 is frequently scanned and attacked (e.g., brute-force logins, credential stuffing, data exfiltration, and abuses like UDF-based RCE or SELECT ... INTO OUTFILE), so admins often restrict exposure and enforce SSL and strong authentication.

TCP 3306