1521
Oracle DB
High RiskTCP — Database
Port Overview
Port Number
1521
Service Name
Oracle DB
Transport Protocol
TCP
Category
Database
Security Risk
High
Port Range
Registered (1024-49151)
What is Port 1521?
Oracle Database listener. The default port for Oracle Database TNS (Transparent Network Substrate) connections. Enterprise database commonly used in large organizations.
TCP
Database
Commonly Used
Security Considerations
Port 1521 (Oracle DB) is classified as high risk. This port is a common target for automated scanning and brute-force attacks. If you must expose it, restrict access to known IP addresses.
Recommendation: Use firewall rules to whitelist trusted IPs. Enable rate limiting and intrusion detection.