Registered · Cross-platform

1521 Oracle DB listener

TCP Yes
UDP Unofficial
SCTP —
DCCP —

What it is

Oracle Net Services default listener (TNS).

When / why

Oracle client connections. Restrict to application servers.

Protocol status detail

TransportStatusMeaning
TCP Yes Assigned by IANA and standardized, specified, or widely used on this port.
UDP Unofficial Not assigned by IANA, but standardized, specified, or widely used on this port.
SCTP — Not applicable for this transport.
DCCP — Not applicable for this transport.
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Port range

Registered (1024–49151). Assigned by IANA on request; usable without elevated privileges on most systems.

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