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// Other services

Port 3326: SFTU

Port 3326 is assigned by IANA to sftu (SFTU).

3326

How sftu works

Other services
client:3326sfturesponse client:3326sfturesponse

The client sends a request to port 3326 and the sftu 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 3326 dangerous?

We have no specific security note for port 3326. 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 3326

ServicePortTransportDescriptionReferenceUpdated
sftu 3326 TCP, UDP SFTU - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3326, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3326'      # process listening on 3326
sudo lsof -nP -i :3326

macOS

sudo lsof -nP -i :3326

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3326 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3326
netstat -ano | findstr :3326

From another machine

nmap -p 3326 -sV <host>
sudo nmap -sU -p 3326 <host>
nc -zv <host> 3326

Block it in the firewall

sudo ufw deny 3326/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3326" -Direction Inbound -LocalPort 3326 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3326 used for?

Port 3326 is assigned by IANA to sftu (SFTU).

Is port 3326 TCP or UDP?

Port 3326 is registered for TCP and UDP.

Is it safe to open port 3326?

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 3326 is open?

On Linux run "ss -ltnup 'sport = :3326'", on macOS "lsof -nP -i :3326", and on Windows "netstat -ano | findstr :3326" to see the local process. From another machine, "nmap -p 3326 <host>" shows whether it is reachable.

05 Related
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