Port 10439BalanceNG Session Table Synchronization

BalanceNG uses UDP 10439 to synchronize session-table state between load-balancer instances.

transport: udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as bngsync, BalanceNG session synchronization

Technical Details

what runs on :10439

The registered service is BalanceNG session-table synchronization. It uses UDP, so there is no TCP connection handshake or stream; the application exchanges session state between BalanceNG peers. The port assignment identifies the purpose, but does not establish details such as message framing, authentication, or encryption.

Security Information

exposure of :10439

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.6 across 1,877 ports — this one sits 0.6 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Keep this traffic limited to trusted BalanceNG peers rather than exposing it to the internet. The registry assignment does not establish whether the protocol authenticates or encrypts updates, so do not assume those protections; restrict access with network controls. The supplied scan data reports no internet-wide observations of this port open.

Record

iana registry entry

port: :10439
service: BalanceNG Session Table Synchronization
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: This is BalanceNG's session-table synchronization service, used to share connection state between cooperating load-balancer instances. It is for communication between BalanceNG peers, not a client-facing application service.
lookups: 0rank 993
added: 2026-10-16
updated: 2026-10-16
references: IANA service name registry — port 10439

Something wrong?

This record is maintained by the engineers who use port 10439. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-16.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :10439BalanceNG Session Table Synchronization

Technical Details

Security Information

Related Ports

Port 10439BalanceNG Session Table Synchronization