CyberHunter
Local dataset, no network
// Other services

Port 10439: BalanceNG session table synchronization protocol

Port 10439 is assigned by IANA to bngsync (BalanceNG session table synchronization protocol).

10439

How bngsync works

Other services
client:10439bngsyncresponse client:10439bngsyncresponse

The client sends a request to port 10439 and the bngsync service answers.

Transport
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 10439 dangerous?

We have no specific security note for port 10439. 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 10439

ServicePortTransportDescriptionReferenceUpdated
bngsync 10439 UDP BalanceNG session table synchronization protocol - 2014-05-02
-10439-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 10439, and is it reachable?

Linux

sudo ss -ltnup 'sport = :10439'      # process listening on 10439
sudo lsof -nP -i :10439

macOS

sudo lsof -nP -i :10439

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 10439 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 10439
netstat -ano | findstr :10439

From another machine

nmap -p 10439 -sV <host>
sudo nmap -sU -p 10439 <host>
nc -zv <host> 10439

Block it in the firewall

sudo ufw deny 10439/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 10439" -Direction Inbound -LocalPort 10439 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 10439 used for?

Port 10439 is assigned by IANA to bngsync (BalanceNG session table synchronization protocol).

Is port 10439 TCP or UDP?

Port 10439 is registered for UDP.

Is it safe to open port 10439?

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 10439 is open?

On Linux run "ss -ltnup 'sport = :10439'", on macOS "lsof -nP -i :10439", and on Windows "netstat -ano | findstr :10439" to see the local process. From another machine, "nmap -p 10439 <host>" shows whether it is reachable.

05 Related
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