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Port 1439 (eicon-x25)

IANA assigns port 1439 to eicon-x25: Eicon X25/SNA Gateway.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
eicon-x25 TCP Eicon X25/SNA Gateway - -
eicon-x25 UDP Eicon X25/SNA Gateway - -

Check what is listening on port 1439

Linux: is anything listening on TCP 1439?
sudo ss -tlnp 'sport = :1439'
Linux: UDP 1439
sudo ss -ulnp 'sport = :1439'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1439
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1439 '
Windows (Command Prompt)
netstat -ano | findstr :1439
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1439 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1439
From Windows
Test-NetConnection HOST -Port 1439
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1439

Block port 1439 in the firewall

ufw
sudo ufw deny 1439/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1439 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1439 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1439' -Direction Inbound -Protocol TCP -LocalPort 1439 -Action Block
ufw
sudo ufw deny 1439/udp
iptables
sudo iptables -A INPUT -p udp --dport 1439 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1439 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1439' -Direction Inbound -Protocol UDP -LocalPort 1439 -Action Block

Related ports

1437tabula1438eicon-server1440eicon-slp1441cadis-1

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