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// Network services

Port 43439: EQ3 discovery and configuration

Port 43439 is assigned by IANA to eq3-config (EQ3 discovery and configuration), eq3-update (EQ3 firmware update).

43439

How eq3-config works

Network services
client:43439eq3-configresponse client:43439eq3-configresponse

The client sends a request to port 43439 and the eq3-config service answers.

Transport
UDP · TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Network services
01 Security

Is port 43439 dangerous?

We have no specific security note for port 43439. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 43439

ServicePortTransportDescriptionReferenceUpdated
eq3-config 43439 UDP EQ3 discovery and configuration - 2014-05-09
eq3-update 43439 TCP EQ3 firmware update - 2014-05-09

// source: IANA service name and port number registry

03 Check it

Which program uses port 43439, and is it reachable?

Linux

sudo ss -ltnup 'sport = :43439'      # process listening on 43439
sudo lsof -nP -i :43439

macOS

sudo lsof -nP -i :43439

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 43439 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 43439
netstat -ano | findstr :43439

From another machine

nmap -p 43439 -sV <host>
sudo nmap -sU -p 43439 <host>
nc -zv <host> 43439

Block it in the firewall

sudo ufw deny 43439/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 43439" -Direction Inbound -LocalPort 43439 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 43439 used for?

Port 43439 is assigned by IANA to eq3-config (EQ3 discovery and configuration), eq3-update (EQ3 firmware update).

Is port 43439 TCP or UDP?

Port 43439 is registered for UDP and TCP.

Is it safe to open port 43439?

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. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 43439 is open?

On Linux run "ss -ltnup 'sport = :43439'", on macOS "lsof -nP -i :43439", and on Windows "netstat -ano | findstr :43439" to see the local process. From another machine, "nmap -p 43439 <host>" shows whether it is reachable.

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