Port 1521 — Oracle DB
Quick reference for TCP/UDP port 1521, used by Oracle DB. Includes what the service does, security guidance and related ports.
What is port 1521?
Oracle database listener.
What port does Oracle DB use?
Oracle DB listens on port 1521 by default.
Security guidance
High risk — do not expose to the internet
Port 1521 (Oracle DB) 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 1521 used for?+
Port 1521 is the standard TCP/UDP port for Oracle DB. Oracle database listener.
What port does Oracle DB use?+
Oracle DB listens on port 1521 by default.
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