CyberHunter
Local dataset, no network
// Other services

Port 2239: Image Query

Port 2239 is assigned by IANA to imagequery (Image Query).

2239

How imagequery works

Other services
client:2239imagequeryresponse client:2239imagequeryresponse

The client sends a request to port 2239 and the imagequery 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 2239 dangerous?

We have no specific security note for port 2239. 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 2239

ServicePortTransportDescriptionReferenceUpdated
imagequery 2239 TCP, UDP Image Query - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2239, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2239'      # process listening on 2239
sudo lsof -nP -i :2239

macOS

sudo lsof -nP -i :2239

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2239 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2239
netstat -ano | findstr :2239

From another machine

nmap -p 2239 -sV <host>
sudo nmap -sU -p 2239 <host>
nc -zv <host> 2239

Block it in the firewall

sudo ufw deny 2239/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2239" -Direction Inbound -LocalPort 2239 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2239 used for?

Port 2239 is assigned by IANA to imagequery (Image Query).

Is port 2239 TCP or UDP?

Port 2239 is registered for TCP and UDP.

Is it safe to open port 2239?

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 2239 is open?

On Linux run "ss -ltnup 'sport = :2239'", on macOS "lsof -nP -i :2239", and on Windows "netstat -ano | findstr :2239" to see the local process. From another machine, "nmap -p 2239 <host>" shows whether it is reachable.

05 Related
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