CyberHunter
Local dataset, no network
// Other services

Port 1439: Eicon X25/SNA Gateway

Port 1439 is assigned by IANA to eicon-x25 (Eicon X25/SNA Gateway).

1439

How eicon-x25 works

Other services
client:1439eicon-x25response client:1439eicon-x25response

The client sends a request to port 1439 and the eicon-x25 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 1439 dangerous?

We have no specific security note for port 1439. 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 1439

ServicePortTransportDescriptionReferenceUpdated
eicon-x25 1439 TCP, UDP Eicon X25/SNA Gateway - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1439, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1439'      # process listening on 1439
sudo lsof -nP -i :1439

macOS

sudo lsof -nP -i :1439

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1439 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1439
netstat -ano | findstr :1439

From another machine

nmap -p 1439 -sV <host>
sudo nmap -sU -p 1439 <host>
nc -zv <host> 1439

Block it in the firewall

sudo ufw deny 1439/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1439" -Direction Inbound -LocalPort 1439 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1439 used for?

Port 1439 is assigned by IANA to eicon-x25 (Eicon X25/SNA Gateway).

Is port 1439 TCP or UDP?

Port 1439 is registered for TCP and UDP.

Is it safe to open port 1439?

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 1439 is open?

On Linux run "ss -ltnup 'sport = :1439'", on macOS "lsof -nP -i :1439", and on Windows "netstat -ano | findstr :1439" to see the local process. From another machine, "nmap -p 1439 <host>" shows whether it is reachable.

05 Related
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