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// Other services

Port 4039: Fazzt Administration

Port 4039 is assigned by IANA to fazzt-admin (Fazzt Administration).

4039

How fazzt-admin works

Other services
client:4039fazzt-adminresponse client:4039fazzt-adminresponse

The client sends a request to port 4039 and the fazzt-admin 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 4039 dangerous?

We have no specific security note for port 4039. 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 4039

ServicePortTransportDescriptionReferenceUpdated
fazzt-admin 4039 TCP, UDP Fazzt Administration - 2006-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 4039, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4039'      # process listening on 4039
sudo lsof -nP -i :4039

macOS

sudo lsof -nP -i :4039

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4039 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4039
netstat -ano | findstr :4039

From another machine

nmap -p 4039 -sV <host>
sudo nmap -sU -p 4039 <host>
nc -zv <host> 4039

Block it in the firewall

sudo ufw deny 4039/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4039" -Direction Inbound -LocalPort 4039 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4039 used for?

Port 4039 is assigned by IANA to fazzt-admin (Fazzt Administration).

Is port 4039 TCP or UDP?

Port 4039 is registered for TCP and UDP.

Is it safe to open port 4039?

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 4039 is open?

On Linux run "ss -ltnup 'sport = :4039'", on macOS "lsof -nP -i :4039", and on Windows "netstat -ano | findstr :4039" to see the local process. From another machine, "nmap -p 4039 <host>" shows whether it is reachable.

05 Related
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