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Port 1406 (netlabs-lm)

IANA assigns port 1406 to netlabs-lm: NetLabs License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netlabs-lm TCP NetLabs License Manager - -
netlabs-lm UDP NetLabs License Manager - -

Check what is listening on port 1406

Linux: is anything listening on TCP 1406?
sudo ss -tlnp 'sport = :1406'
Linux: UDP 1406
sudo ss -ulnp 'sport = :1406'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1406
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1406 '
Windows (Command Prompt)
netstat -ano | findstr :1406
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1406 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1406
From Windows
Test-NetConnection HOST -Port 1406
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1406

Block port 1406 in the firewall

ufw
sudo ufw deny 1406/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1406 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1406 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1406' -Direction Inbound -Protocol TCP -LocalPort 1406 -Action Block
ufw
sudo ufw deny 1406/udp
iptables
sudo iptables -A INPUT -p udp --dport 1406 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1406 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1406' -Direction Inbound -Protocol UDP -LocalPort 1406 -Action Block

Related ports

1404igi-lm1405ibm-res1407tibet-server1408sophia-lm

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