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// Other services

Port 4038: Fazzt Point-To-Point

Port 4038 is assigned by IANA to fazzt-ptp (Fazzt Point-To-Point).

4038

How fazzt-ptp works

Other services
client:4038fazzt-ptpresponse client:4038fazzt-ptpresponse

The client sends a request to port 4038 and the fazzt-ptp 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 4038 dangerous?

We have no specific security note for port 4038. 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 4038

ServicePortTransportDescriptionReferenceUpdated
fazzt-ptp 4038 TCP, UDP Fazzt Point-To-Point - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4038, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4038'      # process listening on 4038
sudo lsof -nP -i :4038

macOS

sudo lsof -nP -i :4038

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4038 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4038
netstat -ano | findstr :4038

From another machine

nmap -p 4038 -sV <host>
sudo nmap -sU -p 4038 <host>
nc -zv <host> 4038

Block it in the firewall

sudo ufw deny 4038/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4038" -Direction Inbound -LocalPort 4038 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4038 used for?

Port 4038 is assigned by IANA to fazzt-ptp (Fazzt Point-To-Point).

Is port 4038 TCP or UDP?

Port 4038 is registered for TCP and UDP.

Is it safe to open port 4038?

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 4038 is open?

On Linux run "ss -ltnup 'sport = :4038'", on macOS "lsof -nP -i :4038", and on Windows "netstat -ano | findstr :4038" to see the local process. From another machine, "nmap -p 4038 <host>" shows whether it is reachable.

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