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// Other services

Port 4320: FDT Remote Categorization Protocol

Port 4320 is assigned by IANA to fdt-rcatp (FDT Remote Categorization Protocol).

4320

How fdt-rcatp works

Other services
client:4320fdt-rcatpresponse client:4320fdt-rcatpresponse

The client sends a request to port 4320 and the fdt-rcatp 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 4320 dangerous?

We have no specific security note for port 4320. 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 4320

ServicePortTransportDescriptionReferenceUpdated
fdt-rcatp 4320 TCP, UDP FDT Remote Categorization Protocol - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 4320, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4320'      # process listening on 4320
sudo lsof -nP -i :4320

macOS

sudo lsof -nP -i :4320

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4320 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4320
netstat -ano | findstr :4320

From another machine

nmap -p 4320 -sV <host>
sudo nmap -sU -p 4320 <host>
nc -zv <host> 4320

Block it in the firewall

sudo ufw deny 4320/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4320" -Direction Inbound -LocalPort 4320 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4320 used for?

Port 4320 is assigned by IANA to fdt-rcatp (FDT Remote Categorization Protocol).

Is port 4320 TCP or UDP?

Port 4320 is registered for TCP and UDP.

Is it safe to open port 4320?

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 4320 is open?

On Linux run "ss -ltnup 'sport = :4320'", on macOS "lsof -nP -i :4320", and on Windows "netstat -ano | findstr :4320" to see the local process. From another machine, "nmap -p 4320 <host>" shows whether it is reachable.

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