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Port 589 (eyelink)

IANA assigns port 589 to eyelink: EyeLink.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
eyelink TCP EyeLink Dave Stampe -
eyelink UDP EyeLink Dave Stampe -

Check what is listening on port 589

Linux: is anything listening on TCP 589?
sudo ss -tlnp 'sport = :589'
Linux: UDP 589
sudo ss -ulnp 'sport = :589'
Linux / macOS: which process owns the port
sudo lsof -nP -i :589
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':589 '
Windows (Command Prompt)
netstat -ano | findstr :589
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 589 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 589
From Windows
Test-NetConnection HOST -Port 589
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 589

Block port 589 in the firewall

ufw
sudo ufw deny 589/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 589 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 589 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 589' -Direction Inbound -Protocol TCP -LocalPort 589 -Action Block
ufw
sudo ufw deny 589/udp
iptables
sudo iptables -A INPUT -p udp --dport 589 -j DROP
nftables
sudo nft add rule inet filter input udp dport 589 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 589' -Direction Inbound -Protocol UDP -LocalPort 589 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.