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// Other services

Port 447: DDM-Distributed File Management

Port 447 is assigned by IANA to ddm-dfm (DDM-Distributed File Management).

447

How ddm-dfm works

Other services
client:447ddm-dfmresponse client:447ddm-dfmresponse

The client sends a request to port 447 and the ddm-dfm 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 447 dangerous?

We have no specific security note for port 447. 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 447

ServicePortTransportDescriptionReferenceUpdated
ddm-dfm 447 TCP, UDP DDM-Distributed File Management - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 447, and is it reachable?

Linux

sudo ss -ltnup 'sport = :447'      # process listening on 447
sudo lsof -nP -i :447

macOS

sudo lsof -nP -i :447

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 447 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 447
netstat -ano | findstr :447

From another machine

nmap -p 447 -sV <host>
sudo nmap -sU -p 447 <host>
nc -zv <host> 447

Block it in the firewall

sudo ufw deny 447/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 447" -Direction Inbound -LocalPort 447 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 447 used for?

Port 447 is assigned by IANA to ddm-dfm (DDM-Distributed File Management).

Is port 447 TCP or UDP?

Port 447 is registered for TCP and UDP.

Is it safe to open port 447?

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 447 is open?

On Linux run "ss -ltnup 'sport = :447'", on macOS "lsof -nP -i :447", and on Windows "netstat -ano | findstr :447" to see the local process. From another machine, "nmap -p 447 <host>" shows whether it is reachable.

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