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// IoT & industrial (ICS)

Port 17754: Encap. ZigBee Packets

Port 17754 is assigned by IANA to zep (Encap. ZigBee Packets).

17754

How zep works

IoT & industrial (ICS)
controllerPLCzepno authentication controllerPLCzepno authentication

A controller sends commands to an industrial device on port 17754, 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 17754 dangerous?

We have no specific security note for port 17754. 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 17754

ServicePortTransportDescriptionReferenceUpdated
zep 17754 TCP, UDP Encap. ZigBee Packets - 2006-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 17754, and is it reachable?

Linux

sudo ss -ltnup 'sport = :17754'      # process listening on 17754
sudo lsof -nP -i :17754

macOS

sudo lsof -nP -i :17754

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 17754 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 17754
netstat -ano | findstr :17754

From another machine

nmap -p 17754 -sV <host>
sudo nmap -sU -p 17754 <host>
nc -zv <host> 17754

Block it in the firewall

sudo ufw deny 17754/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 17754" -Direction Inbound -LocalPort 17754 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 17754 used for?

Port 17754 is assigned by IANA to zep (Encap. ZigBee Packets).

Is port 17754 TCP or UDP?

Port 17754 is registered for TCP and UDP.

Is it safe to open port 17754?

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 17754 is open?

On Linux run "ss -ltnup 'sport = :17754'", on macOS "lsof -nP -i :17754", and on Windows "netstat -ano | findstr :17754" to see the local process. From another machine, "nmap -p 17754 <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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