CyberHunter
Local dataset, no network
// Other services

Port 2439: SybaseDBSynch

Port 2439 is assigned by IANA to sybasedbsynch (SybaseDBSynch).

2439

How sybasedbsynch works

Other services
client:2439sybasedbsynchresponse client:2439sybasedbsynchresponse

The client sends a request to port 2439 and the sybasedbsynch 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 2439 dangerous?

We have no specific security note for port 2439. 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 2439

ServicePortTransportDescriptionReferenceUpdated
sybasedbsynch 2439 TCP, UDP SybaseDBSynch - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2439, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2439'      # process listening on 2439
sudo lsof -nP -i :2439

macOS

sudo lsof -nP -i :2439

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2439 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2439
netstat -ano | findstr :2439

From another machine

nmap -p 2439 -sV <host>
sudo nmap -sU -p 2439 <host>
nc -zv <host> 2439

Block it in the firewall

sudo ufw deny 2439/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2439" -Direction Inbound -LocalPort 2439 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2439 used for?

Port 2439 is assigned by IANA to sybasedbsynch (SybaseDBSynch).

Is port 2439 TCP or UDP?

Port 2439 is registered for TCP and UDP.

Is it safe to open port 2439?

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 2439 is open?

On Linux run "ss -ltnup 'sport = :2439'", on macOS "lsof -nP -i :2439", and on Windows "netstat -ano | findstr :2439" to see the local process. From another machine, "nmap -p 2439 <host>" shows whether it is reachable.

05 Related
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