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// Other services

Port 18769: IQue Protocol

Port 18769 is assigned by IANA to ique (IQue Protocol).

18769

How ique works

Other services
client:18769iqueresponse client:18769iqueresponse

The client sends a request to port 18769 and the ique service answers.

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
Other services
01 Security

Is port 18769 dangerous?

We have no specific security note for port 18769. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 18769

ServicePortTransportDescriptionReferenceUpdated
ique 18769 TCP, UDP IQue Protocol - 2002-07

// source: IANA service name and port number registry

03 Check it

Which program uses port 18769, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18769'      # process listening on 18769
sudo lsof -nP -i :18769

macOS

sudo lsof -nP -i :18769

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18769 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18769
netstat -ano | findstr :18769

From another machine

nmap -p 18769 -sV <host>
sudo nmap -sU -p 18769 <host>
nc -zv <host> 18769

Block it in the firewall

sudo ufw deny 18769/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18769" -Direction Inbound -LocalPort 18769 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18769 used for?

Port 18769 is assigned by IANA to ique (IQue Protocol).

Is port 18769 TCP or UDP?

Port 18769 is registered for TCP and UDP.

Is it safe to open port 18769?

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. Close the port if nothing on the host needs it.

How do I check if port 18769 is open?

On Linux run "ss -ltnup 'sport = :18769'", on macOS "lsof -nP -i :18769", and on Windows "netstat -ano | findstr :18769" to see the local process. From another machine, "nmap -p 18769 <host>" shows whether it is reachable.

05 Related
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