Managing Oracle Database Port Numbers

About Managing Ports

Oracle Database components are assigned ports during installation from predefined ranges, beginning with the lowest available number. Administrators should review these assignments, prevent conflicts between services, and use /bin/netstat -a to identify ports currently in use. Oracle checks for ports occupied by other Oracle installations, active processes, or entries in /etc/services, advancing through the assigned range until it finds an available port.

Oracle Database Component Port Numbers and Protocols

During a single-instance installation, the Oracle Net Services Listener typically uses TCP port 1521 and can be reassigned with Net Configuration Assistant, while Oracle Connection Manager uses TCP port 1630 and is configured in cman.ora. Oracle XML DB HTTP and FTP ports default to 0 and must be configured manually for HTTP or FTP access.
Read More: Oracle Database Component Port Numbers and Protocols