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// IoT & industrial (ICS)

Port 2404: IEC 60870-5-104 process control over IP

Port 2404 is assigned by IANA to iec-104 (IEC 60870-5-104 process control over IP).

2404

How iec-104 works

IoT & industrial (ICS)
controllerPLCiec-104no authentication controllerPLCiec-104no authentication

A controller sends commands to an industrial device on port 2404, which acts on the physical process.

Transport
TCP · 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 2404 dangerous?

We have no specific security note for port 2404. 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 2404

ServicePortTransportDescriptionReferenceUpdated
iec-104 2404 TCP, UDP IEC 60870-5-104 process control over IP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2404, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2404'      # process listening on 2404
sudo lsof -nP -i :2404

macOS

sudo lsof -nP -i :2404

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2404 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2404
netstat -ano | findstr :2404

From another machine

nmap -p 2404 -sV <host>
sudo nmap -sU -p 2404 <host>
nc -zv <host> 2404

Block it in the firewall

sudo ufw deny 2404/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2404" -Direction Inbound -LocalPort 2404 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2404 used for?

Port 2404 is assigned by IANA to iec-104 (IEC 60870-5-104 process control over IP).

Is port 2404 TCP or UDP?

Port 2404 is registered for TCP and UDP.

Is it safe to open port 2404?

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 2404 is open?

On Linux run "ss -ltnup 'sport = :2404'", on macOS "lsof -nP -i :2404", and on Windows "netstat -ano | findstr :2404" to see the local process. From another machine, "nmap -p 2404 <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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