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Port 394 (embl-ndt)

IANA assigns port 394 to embl-ndt: EMBL Nucleic Data Transfer.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
embl-ndt TCP EMBL Nucleic Data Transfer Peter Gad -
embl-ndt UDP EMBL Nucleic Data Transfer Peter Gad -

Check what is listening on port 394

Linux: is anything listening on TCP 394?
sudo ss -tlnp 'sport = :394'
Linux: UDP 394
sudo ss -ulnp 'sport = :394'
Linux / macOS: which process owns the port
sudo lsof -nP -i :394
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':394 '
Windows (Command Prompt)
netstat -ano | findstr :394
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 394 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 394
From Windows
Test-NetConnection HOST -Port 394
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 394

Block port 394 in the firewall

ufw
sudo ufw deny 394/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 394 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 394 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 394' -Direction Inbound -Protocol TCP -LocalPort 394 -Action Block
ufw
sudo ufw deny 394/udp
iptables
sudo iptables -A INPUT -p udp --dport 394 -j DROP
nftables
sudo nft add rule inet filter input udp dport 394 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 394' -Direction Inbound -Protocol UDP -LocalPort 394 -Action Block

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