Port 16385Reliable Datagram Sockets (RDS)

Oracle Reliable Datagram Sockets (RDS) transport for high-performance messaging, chiefly between Oracle RAC cluster nodes.

inDatabases Network Services

transport: tcp
in transit: cleartext
assignment: official
risk: 6/10
lookups: 0

also known as rdgs, Oracle RDS

Technical Details

what runs on :16385

RDS provides reliable message delivery with datagram-style semantics. In the TCP transport, peers establish a TCP connection to port 16385 and exchange RDS-framed messages over it; this is distinct from ordinary Oracle Net traffic. RDS is also implemented over transports such as InfiniBand, so the TCP port is relevant specifically when RDS/TCP is in use. Oracle RAC uses RDS for low-latency inter-node communication, including cluster database messaging.

Security Information

exposure of :16385

risk score

6/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

databases averages 3.8 across 168 ports — this one sits 2.2 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp

every listening transport is another surface to filter at the edge

security overview

RDS traffic is not encrypted by default and is intended for trusted cluster communication, not public clients. Keep TCP/16385 restricted to the database cluster interconnect and trusted peers; internet exposure could reveal or put sensitive internal cluster traffic and its protocol implementation within reach of attackers.

Record

iana registry entry

port: :16385
service: Reliable Datagram Sockets (RDS)
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 6/10risk
category: Databases Network Services
usage: TCP/16385 is assigned to Reliable Datagram Sockets, a message-transport protocol associated with Oracle. Engineers are most likely to encounter it on an Oracle RAC interconnect, where cluster nodes exchange internal database messages; it is not an Oracle SQL client port.
lookups: 0rank 993
added: 2026-10-17
updated: 2026-10-17
references: IANA service name registry — port 16385

Something wrong?

This record is maintained by the engineers who use port 16385. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-17.

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Related Ports

all 168 in databases →

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:18206	Audition FAM DB	TCPUDP	Databases	caution	19.1k

risk mix of the 8 listed

caution100%

1 of 8 encrypted

Port :16385Reliable Datagram Sockets (RDS)

Technical Details

Security Information

Related Ports

Port 16385Reliable Datagram Sockets (RDS)