Port 19020SEGGER J-Link Remote Server

Default TCP endpoint for SEGGER J-Link Remote Server, letting J-Link software debug a probe-connected target over a network.

inRemote Access System

transport: tcp
in transit: cleartext
assignment: official
risk: 8/10
lookups: 0

also known as J-Link TCP/IP Protocol

Technical Details

what runs on :19020

This is the TCP endpoint for SEGGER's proprietary J-Link client/server protocol, not a general-purpose web service. A J-Link client connects to the Remote Server, which brokers debug operations to a locally attached J-Link probe and target. The protocol's wire framing is proprietary; port 19020 is the documented default, and the traffic is not encrypted by default. The IANA assignment names the protocol, but the practical listener is typically SEGGER's J-Link Remote Server software.

Security Information

exposure of :19020

risk score

8/ 10risk

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

remote access averages 4.0 across 238 ports — this one sits 4.0 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

An exposed server can give a remote client substantial control over the attached debug probe and target, including reading or modifying target memory and programming firmware. Do not expose it directly to the internet; restrict access with firewall rules or a VPN, and use available server-side access controls such as password protection. Traffic is not encrypted by default.

Record

iana registry entry

port: :19020
service: SEGGER J-Link Remote Server
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 8/10risk
category: Remote Access System
usage: SEGGER J-Link Remote Server listens on TCP port 19020 by default, allowing J-Link software to use a probe attached to another host. Engineers encounter it when remote debugging or programming embedded targets.
lookups: 0rank 993
added: 2026-10-18
updated: 2026-10-18
references: IANA service name registry — port 19020

Something wrong?

This record is maintained by the engineers who use port 19020. 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.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

Related Ports

all 238 in remote access →

the 8 most looked-up other ports in remote access — 238 ports carry that label.

port	service	proto	category	risk	views
:8000	Intel Remote Desktop / Alternate HTTP Port	TCP	Web Services	safe	84.3k
:8888	D2GS Admin Console	TCP	Remote Access	caution	83.7k
:8881	Atlasz Secure Server	TCP	Web Services	caution	67.6k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:8008	IBM HTTP Server Admin	TCP	Web Services	caution	58.3k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:23	Telnet	TCP	Remote Access	caution	34.8k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :19020SEGGER J-Link Remote Server

Technical Details

Security Information

Related Ports

Port 19020SEGGER J-Link Remote Server