Port 1658Sixnet UDR

Sixnet UDR industrial-device communications service using TCP or UDP.

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

Technical Details

what runs on :1658

Sixnet UDR is registered on port :1658 over tcp and udp to Red Lion Controls. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is found open rarely. What's listening is often not the registered service, so check before you assume.

find what's listening on :1658

this machine

# linux
sudo ss -tulpn 'sport = :1658'

# macos / bsd
sudo lsof -nP -i :1658

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :1658

another host

nmap -sV -p T:1658 <host>
sudo nmap -sU -sV -p U:1658 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :1658

risk score

1/ 10safe

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

iot averages 3.4 across 149 ports — this one sits 2.4 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

no security notes recorded for :1658 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :1658
service: Sixnet UDR
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: IoT
usage: Sixnet UDR is an IANA-registered service associated with Red Lion Controls and its Sixnet product line. The assignment covers both TCP and UDP, but the service is rarely observed exposed on the public internet.
lookups: 0rank 993
added: 2026-09-09
updated: 2026-09-09
references: IANA service name registry — port 1658

Something wrong?

This record is maintained by the engineers who use port 1658. 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 2026-09-09.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 149 in iot →

the 8 most looked-up other ports in iot — 149 ports carry that label.

port	service	proto	category	risk	views
:6543	Jetnet	UDP	Network Services	caution	65.3k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:9600	Omron FINS Communication	UDP	Network Services	caution	33.2k
:4840	OPC UA TCP	TCPUDP	Network Services	caution	26.6k
:5678	Mikrotik MNDP	UDP	Network Services	caution	24.7k
:4843	OPC UA over TLS/SSL	TCPUDPtls	Security	caution	24.6k
:5001	Slingbox	TCP	Streaming	caution	22.4k
:15000	Hypack Data Acquisition	TCP	Network Services	caution	21.4k

risk mix of the 8 listed

caution100%

1 of 8 encrypted

Port :1658Sixnet UDR

Technical Details

Security Information

Related Ports

Port 1658Sixnet UDR