CyberHunter
Local dataset, no network
// Other services

Port 3804: Harman IQNet Port

Port 3804 is assigned by IANA to iqnet-port (Harman IQNet Port).

3804

How iqnet-port works

Other services
client:3804iqnet-portresponse client:3804iqnet-portresponse

The client sends a request to port 3804 and the iqnet-port 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 3804 dangerous?

We have no specific security note for port 3804. 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 3804

ServicePortTransportDescriptionReferenceUpdated
iqnet-port 3804 TCP, UDP Harman IQNet Port - 2004-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3804, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3804'      # process listening on 3804
sudo lsof -nP -i :3804

macOS

sudo lsof -nP -i :3804

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3804 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3804
netstat -ano | findstr :3804

From another machine

nmap -p 3804 -sV <host>
sudo nmap -sU -p 3804 <host>
nc -zv <host> 3804

Block it in the firewall

sudo ufw deny 3804/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3804" -Direction Inbound -LocalPort 3804 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3804 used for?

Port 3804 is assigned by IANA to iqnet-port (Harman IQNet Port).

Is port 3804 TCP or UDP?

Port 3804 is registered for TCP and UDP.

Is it safe to open port 3804?

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 3804 is open?

On Linux run "ss -ltnup 'sport = :3804'", on macOS "lsof -nP -i :3804", and on Windows "netstat -ano | findstr :3804" to see the local process. From another machine, "nmap -p 3804 <host>" shows whether it is reachable.

05 Related
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