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// Other services

Port 747: Fujitsu Device Control

Port 747 is assigned by IANA to fujitsu-dev (Fujitsu Device Control).

747

How fujitsu-dev works

Other services
client:747fujitsu-devresponse client:747fujitsu-devresponse

The client sends a request to port 747 and the fujitsu-dev 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 747 dangerous?

We have no specific security note for port 747. 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 747

ServicePortTransportDescriptionReferenceUpdated
fujitsu-dev 747 TCP, UDP Fujitsu Device Control - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 747, and is it reachable?

Linux

sudo ss -ltnup 'sport = :747'      # process listening on 747
sudo lsof -nP -i :747

macOS

sudo lsof -nP -i :747

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 747 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 747
netstat -ano | findstr :747

From another machine

nmap -p 747 -sV <host>
sudo nmap -sU -p 747 <host>
nc -zv <host> 747

Block it in the firewall

sudo ufw deny 747/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 747" -Direction Inbound -LocalPort 747 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 747 used for?

Port 747 is assigned by IANA to fujitsu-dev (Fujitsu Device Control).

Is port 747 TCP or UDP?

Port 747 is registered for TCP and UDP.

Is it safe to open port 747?

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 747 is open?

On Linux run "ss -ltnup 'sport = :747'", on macOS "lsof -nP -i :747", and on Windows "netstat -ano | findstr :747" to see the local process. From another machine, "nmap -p 747 <host>" shows whether it is reachable.

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