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// Other services

Port 347: Fatmen Server

Port 347 is assigned by IANA to fatserv (Fatmen Server).

347

How fatserv works

Other services
client:347fatservresponse client:347fatservresponse

The client sends a request to port 347 and the fatserv 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 347 dangerous?

We have no specific security note for port 347. 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 347

ServicePortTransportDescriptionReferenceUpdated
fatserv 347 TCP, UDP Fatmen Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 347, and is it reachable?

Linux

sudo ss -ltnup 'sport = :347'      # process listening on 347
sudo lsof -nP -i :347

macOS

sudo lsof -nP -i :347

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 347 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 347
netstat -ano | findstr :347

From another machine

nmap -p 347 -sV <host>
sudo nmap -sU -p 347 <host>
nc -zv <host> 347

Block it in the firewall

sudo ufw deny 347/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 347" -Direction Inbound -LocalPort 347 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 347 used for?

Port 347 is assigned by IANA to fatserv (Fatmen Server).

Is port 347 TCP or UDP?

Port 347 is registered for TCP and UDP.

Is it safe to open port 347?

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 347 is open?

On Linux run "ss -ltnup 'sport = :347'", on macOS "lsof -nP -i :347", and on Windows "netstat -ano | findstr :347" to see the local process. From another machine, "nmap -p 347 <host>" shows whether it is reachable.

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