Port 18635Reliable Datagram Service over IP

An IANA-assigned port for Reliable Datagram Service over IP, a niche message-oriented service associated with Oracle/Linux RDS.

inNetwork Services

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as rds-ip, RDS

Technical Details

what runs on :18635

RDS provides reliable, message-oriented communication rather than a general-purpose application protocol. The IANA entry assigns this service to both TCP and UDP, but does not specify a wire handshake or framing for this port. Linux RDS deployments use different transports, including TCP and RDMA, and the commonly encountered RDS port is 18634; do not assume that an open 18635 listener is the usual RDS transport or that it is present on ordinary systems.

Security Information

exposure of :18635

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.6 across 1,925 ports — this one sits 1.6 below.

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 · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

RDS is intended for communication between trusted hosts, not for general internet exposure. It does not provide application-level encryption by default; if deployed, restrict access to the cluster or service peers and use network-level controls. The assignment is rarely encountered in scans, and there is no basis to treat an open port as a known internet-facing vulnerability by itself.

Record

iana registry entry

port: :18635
service: Reliable Datagram Service over IP
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Network Services
usage: This assignment is for Reliable Datagram Service over IP, associated with Oracle's and Linux's RDS technology for reliable message exchange between hosts. It is a niche cluster or inter-node service, not a common public-facing listener; an open port alone does not establish that a host is running RDS.
lookups: 0rank 993
added: 2026-10-18
updated: 2026-10-18
references: IANA service name registry — port 18635

Something wrong?

This record is maintained by the engineers who use port 18635. 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 2026-10-18.

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edit this record →back to the registry

Related Ports

all 1,925 in network services →

the 8 most looked-up other ports in network services — 1,925 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :18635Reliable Datagram Service over IP

Technical Details

Security Information

Related Ports

Port 18635Reliable Datagram Service over IP