CyberHunter
Local dataset, no network
// Other services

Port 3684: FAXstfX

Port 3684 is assigned by IANA to faxstfx-port (FAXstfX).

3684

How faxstfx-port works

Other services
client:3684faxstfx-portresponse client:3684faxstfx-portresponse

The client sends a request to port 3684 and the faxstfx-port 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 3684 dangerous?

We have no specific security note for port 3684. 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 3684

ServicePortTransportDescriptionReferenceUpdated
faxstfx-port 3684 TCP, UDP FAXstfX - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3684, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3684'      # process listening on 3684
sudo lsof -nP -i :3684

macOS

sudo lsof -nP -i :3684

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3684 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3684
netstat -ano | findstr :3684

From another machine

nmap -p 3684 -sV <host>
sudo nmap -sU -p 3684 <host>
nc -zv <host> 3684

Block it in the firewall

sudo ufw deny 3684/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3684" -Direction Inbound -LocalPort 3684 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3684 used for?

Port 3684 is assigned by IANA to faxstfx-port (FAXstfX).

Is port 3684 TCP or UDP?

Port 3684 is registered for TCP and UDP.

Is it safe to open port 3684?

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 3684 is open?

On Linux run "ss -ltnup 'sport = :3684'", on macOS "lsof -nP -i :3684", and on Windows "netstat -ano | findstr :3684" to see the local process. From another machine, "nmap -p 3684 <host>" shows whether it is reachable.

05 Related
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