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// Other services

Port 3648: Fujitsu Cooperation Port

Port 3648 is assigned by IANA to fjcp (Fujitsu Cooperation Port).

3648

How fjcp works

Other services
client:3648fjcpresponse client:3648fjcpresponse

The client sends a request to port 3648 and the fjcp 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 3648 dangerous?

We have no specific security note for port 3648. 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 3648

ServicePortTransportDescriptionReferenceUpdated
fjcp 3648 TCP, UDP Fujitsu Cooperation Port - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3648, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3648'      # process listening on 3648
sudo lsof -nP -i :3648

macOS

sudo lsof -nP -i :3648

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3648 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3648
netstat -ano | findstr :3648

From another machine

nmap -p 3648 -sV <host>
sudo nmap -sU -p 3648 <host>
nc -zv <host> 3648

Block it in the firewall

sudo ufw deny 3648/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3648" -Direction Inbound -LocalPort 3648 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3648 used for?

Port 3648 is assigned by IANA to fjcp (Fujitsu Cooperation Port).

Is port 3648 TCP or UDP?

Port 3648 is registered for TCP and UDP.

Is it safe to open port 3648?

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 3648 is open?

On Linux run "ss -ltnup 'sport = :3648'", on macOS "lsof -nP -i :3648", and on Windows "netstat -ano | findstr :3648" to see the local process. From another machine, "nmap -p 3648 <host>" shows whether it is reachable.

05 Related
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