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Port 3290 (caps-lm)

IANA assigns port 3290 to caps-lm: CAPS LOGISTICS TOOLKIT - LM.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
caps-lm TCP CAPS LOGISTICS TOOLKIT - LM Joseph Krebs -
caps-lm UDP CAPS LOGISTICS TOOLKIT - LM Joseph Krebs -

Check what is listening on port 3290

Linux: is anything listening on TCP 3290?
sudo ss -tlnp 'sport = :3290'
Linux: UDP 3290
sudo ss -ulnp 'sport = :3290'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3290
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3290 '
Windows (Command Prompt)
netstat -ano | findstr :3290
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3290 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3290
From Windows
Test-NetConnection HOST -Port 3290
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3290

Block port 3290 in the firewall

ufw
sudo ufw deny 3290/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3290 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3290 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3290' -Direction Inbound -Protocol TCP -LocalPort 3290 -Action Block
ufw
sudo ufw deny 3290/udp
iptables
sudo iptables -A INPUT -p udp --dport 3290 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3290 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3290' -Direction Inbound -Protocol UDP -LocalPort 3290 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.