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// Other services

Port 394: EMBL Nucleic Data Transfer

Port 394 is assigned by IANA to embl-ndt (EMBL Nucleic Data Transfer).

394

How embl-ndt works

Other services
client:394embl-ndtresponse client:394embl-ndtresponse

The client sends a request to port 394 and the embl-ndt service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 394 dangerous?

We have no specific security note for port 394. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 394

ServicePortTransportDescriptionReferenceUpdated
embl-ndt 394 TCP, UDP EMBL Nucleic Data Transfer - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 394, and is it reachable?

Linux

sudo ss -ltnup 'sport = :394'      # process listening on 394
sudo lsof -nP -i :394

macOS

sudo lsof -nP -i :394

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 394 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 394
netstat -ano | findstr :394

From another machine

nmap -p 394 -sV <host>
sudo nmap -sU -p 394 <host>
nc -zv <host> 394

Block it in the firewall

sudo ufw deny 394/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 394" -Direction Inbound -LocalPort 394 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 394 used for?

Port 394 is assigned by IANA to embl-ndt (EMBL Nucleic Data Transfer).

Is port 394 TCP or UDP?

Port 394 is registered for TCP and UDP.

Is it safe to open port 394?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 394 is open?

On Linux run "ss -ltnup 'sport = :394'", on macOS "lsof -nP -i :394", and on Windows "netstat -ano | findstr :394" to see the local process. From another machine, "nmap -p 394 <host>" shows whether it is reachable.

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