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Port 1425 (zion-lm)

IANA assigns port 1425 to zion-lm: Zion Software License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
zion-lm TCP Zion Software License Manager David Ferrero -
zion-lm UDP Zion Software License Manager David Ferrero -

Check what is listening on port 1425

Linux: is anything listening on TCP 1425?
sudo ss -tlnp 'sport = :1425'
Linux: UDP 1425
sudo ss -ulnp 'sport = :1425'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1425
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1425 '
Windows (Command Prompt)
netstat -ano | findstr :1425
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1425 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1425
From Windows
Test-NetConnection HOST -Port 1425
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1425

Block port 1425 in the firewall

ufw
sudo ufw deny 1425/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1425 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1425 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1425' -Direction Inbound -Protocol TCP -LocalPort 1425 -Action Block
ufw
sudo ufw deny 1425/udp
iptables
sudo iptables -A INPUT -p udp --dport 1425 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1425 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1425' -Direction Inbound -Protocol UDP -LocalPort 1425 -Action Block

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