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Port 3945 (emcads)

IANA assigns port 3945 to emcads: EMCADS Server Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
emcads TCP EMCADS Server Port Lars Struwe Christen -
emcads UDP EMCADS Server Port Lars Struwe Christen -

Registry dates for this port: registered 2004-01.

Check what is listening on port 3945

Linux: is anything listening on TCP 3945?
sudo ss -tlnp 'sport = :3945'
Linux: UDP 3945
sudo ss -ulnp 'sport = :3945'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3945
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3945 '
Windows (Command Prompt)
netstat -ano | findstr :3945
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3945 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3945
From Windows
Test-NetConnection HOST -Port 3945
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3945

Block port 3945 in the firewall

ufw
sudo ufw deny 3945/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3945 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3945 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3945' -Direction Inbound -Protocol TCP -LocalPort 3945 -Action Block
ufw
sudo ufw deny 3945/udp
iptables
sudo iptables -A INPUT -p udp --dport 3945 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3945 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3945' -Direction Inbound -Protocol UDP -LocalPort 3945 -Action Block

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