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// IoT & industrial (ICS)

Port 47100: Configuration of motors connected to Industrial Ethernet

Port 47100 is assigned by IANA to jvl-mactalk (Configuration of motors connected to Industrial Ethernet).

47100

How jvl-mactalk works

IoT & industrial (ICS)
controllerPLCjvl-mactalkno authentication controllerPLCjvl-mactalkno authentication

A controller sends commands to an industrial device on port 47100, which acts on the physical process.

Transport
UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
IoT & industrial (ICS)
01 Security

Is port 47100 dangerous?

We have no specific security note for port 47100. Its risk depends on the program actually listening on it. General advice for iot & industrial (ics) services:

  • Industrial and IoT protocols often have no authentication: never expose them to the Internet.
  • Segment OT networks from IT and use protocol-aware firewalls.
  • Monitor with an ICS-aware intrusion detection system.
02 Registry

IANA registry entries for port 47100

ServicePortTransportDescriptionReferenceUpdated
jvl-mactalk 47100 UDP Configuration of motors connected to Industrial Ethernet - 2012-12-21
-47100-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 47100, and is it reachable?

Linux

sudo ss -ltnup 'sport = :47100'      # process listening on 47100
sudo lsof -nP -i :47100

macOS

sudo lsof -nP -i :47100

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 47100 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 47100
netstat -ano | findstr :47100

From another machine

nmap -p 47100 -sV <host>
sudo nmap -sU -p 47100 <host>
nc -zv <host> 47100

Block it in the firewall

sudo ufw deny 47100/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 47100" -Direction Inbound -LocalPort 47100 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 47100 used for?

Port 47100 is assigned by IANA to jvl-mactalk (Configuration of motors connected to Industrial Ethernet).

Is port 47100 TCP or UDP?

Port 47100 is registered for UDP.

Is it safe to open port 47100?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Industrial and IoT protocols often have no authentication: never expose them to the Internet.

How do I check if port 47100 is open?

On Linux run "ss -ltnup 'sport = :47100'", on macOS "lsof -nP -i :47100", and on Windows "netstat -ano | findstr :47100" to see the local process. From another machine, "nmap -p 47100 <host>" shows whether it is reachable.

05 Related
:1883 MQTT tcp · udp · high risk :8883 MQTT over TLS tcp · udp · moderate risk :502 Modbus TCP tcp · udp · critical risk :102 Siemens S7 (ISO-TSAP) tcp · udp · critical risk :47808 BACnet udp · tcp · critical risk :20000 DNP3 tcp · udp · sctp · critical risk :44818 EtherNet/IP tcp · udp · critical risk :802 Modbus Application Protocol Secure tcp · udp

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