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// Other services

Port 3353: FATPIPE

Port 3353 is assigned by IANA to fatpipe (FATPIPE).

3353

How fatpipe works

Other services
client:3353fatpiperesponse client:3353fatpiperesponse

The client sends a request to port 3353 and the fatpipe 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 3353 dangerous?

We have no specific security note for port 3353. 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 3353

ServicePortTransportDescriptionReferenceUpdated
fatpipe 3353 TCP, UDP FATPIPE - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3353, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3353'      # process listening on 3353
sudo lsof -nP -i :3353

macOS

sudo lsof -nP -i :3353

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3353 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3353
netstat -ano | findstr :3353

From another machine

nmap -p 3353 -sV <host>
sudo nmap -sU -p 3353 <host>
nc -zv <host> 3353

Block it in the firewall

sudo ufw deny 3353/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3353" -Direction Inbound -LocalPort 3353 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3353 used for?

Port 3353 is assigned by IANA to fatpipe (FATPIPE).

Is port 3353 TCP or UDP?

Port 3353 is registered for TCP and UDP.

Is it safe to open port 3353?

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 3353 is open?

On Linux run "ss -ltnup 'sport = :3353'", on macOS "lsof -nP -i :3353", and on Windows "netstat -ano | findstr :3353" to see the local process. From another machine, "nmap -p 3353 <host>" shows whether it is reachable.

05 Related
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