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Port 1608 (smart-lm)

IANA assigns port 1608 to smart-lm: Smart Corp. License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
smart-lm TCP Smart Corp. License Manager Connie Qiu -
smart-lm UDP Smart Corp. License Manager Connie Qiu -

Check what is listening on port 1608

Linux: is anything listening on TCP 1608?
sudo ss -tlnp 'sport = :1608'
Linux: UDP 1608
sudo ss -ulnp 'sport = :1608'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1608
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1608 '
Windows (Command Prompt)
netstat -ano | findstr :1608
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1608 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1608
From Windows
Test-NetConnection HOST -Port 1608
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1608

Block port 1608 in the firewall

ufw
sudo ufw deny 1608/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1608 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1608 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1608' -Direction Inbound -Protocol TCP -LocalPort 1608 -Action Block
ufw
sudo ufw deny 1608/udp
iptables
sudo iptables -A INPUT -p udp --dport 1608 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1608 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1608' -Direction Inbound -Protocol UDP -LocalPort 1608 -Action Block

Related ports

1606slm-api1607stt1609isysg-lm1610taurus-wh

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