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// Other services

Port 589: EyeLink

Port 589 is assigned by IANA to eyelink (EyeLink).

589

How eyelink works

Other services
client:589eyelinkresponse client:589eyelinkresponse

The client sends a request to port 589 and the eyelink 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 589 dangerous?

We have no specific security note for port 589. 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 589

ServicePortTransportDescriptionReferenceUpdated
eyelink 589 TCP, UDP EyeLink - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 589, and is it reachable?

Linux

sudo ss -ltnup 'sport = :589'      # process listening on 589
sudo lsof -nP -i :589

macOS

sudo lsof -nP -i :589

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 589 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 589
netstat -ano | findstr :589

From another machine

nmap -p 589 -sV <host>
sudo nmap -sU -p 589 <host>
nc -zv <host> 589

Block it in the firewall

sudo ufw deny 589/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 589" -Direction Inbound -LocalPort 589 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 589 used for?

Port 589 is assigned by IANA to eyelink (EyeLink).

Is port 589 TCP or UDP?

Port 589 is registered for TCP and UDP.

Is it safe to open port 589?

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 589 is open?

On Linux run "ss -ltnup 'sport = :589'", on macOS "lsof -nP -i :589", and on Windows "netstat -ano | findstr :589" to see the local process. From another machine, "nmap -p 589 <host>" shows whether it is reachable.

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