CyberHunter
Local dataset, no network
// Other services

Port 3729: Fireking Audit Port

Port 3729 is assigned by IANA to fksp-audit (Fireking Audit Port).

3729

How fksp-audit works

Other services
client:3729fksp-auditresponse client:3729fksp-auditresponse

The client sends a request to port 3729 and the fksp-audit 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 3729 dangerous?

We have no specific security note for port 3729. 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 3729

ServicePortTransportDescriptionReferenceUpdated
fksp-audit 3729 TCP, UDP Fireking Audit Port - 2003-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 3729, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3729'      # process listening on 3729
sudo lsof -nP -i :3729

macOS

sudo lsof -nP -i :3729

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3729 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3729
netstat -ano | findstr :3729

From another machine

nmap -p 3729 -sV <host>
sudo nmap -sU -p 3729 <host>
nc -zv <host> 3729

Block it in the firewall

sudo ufw deny 3729/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3729" -Direction Inbound -LocalPort 3729 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3729 used for?

Port 3729 is assigned by IANA to fksp-audit (Fireking Audit Port).

Is port 3729 TCP or UDP?

Port 3729 is registered for TCP and UDP.

Is it safe to open port 3729?

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 3729 is open?

On Linux run "ss -ltnup 'sport = :3729'", on macOS "lsof -nP -i :3729", and on Windows "netstat -ano | findstr :3729" to see the local process. From another machine, "nmap -p 3729 <host>" shows whether it is reachable.

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