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// Other services

Port 4358: QSNet Nucleus

Port 4358 is assigned by IANA to qsnet-nucl (QSNet Nucleus).

4358

How qsnet-nucl works

Other services
client:4358qsnet-nuclresponse client:4358qsnet-nuclresponse

The client sends a request to port 4358 and the qsnet-nucl 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 4358 dangerous?

We have no specific security note for port 4358. 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 4358

ServicePortTransportDescriptionReferenceUpdated
qsnet-nucl 4358 TCP, UDP QSNet Nucleus - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4358, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4358'      # process listening on 4358
sudo lsof -nP -i :4358

macOS

sudo lsof -nP -i :4358

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4358 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4358
netstat -ano | findstr :4358

From another machine

nmap -p 4358 -sV <host>
sudo nmap -sU -p 4358 <host>
nc -zv <host> 4358

Block it in the firewall

sudo ufw deny 4358/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4358" -Direction Inbound -LocalPort 4358 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4358 used for?

Port 4358 is assigned by IANA to qsnet-nucl (QSNet Nucleus).

Is port 4358 TCP or UDP?

Port 4358 is registered for TCP and UDP.

Is it safe to open port 4358?

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 4358 is open?

On Linux run "ss -ltnup 'sport = :4358'", on macOS "lsof -nP -i :4358", and on Windows "netstat -ano | findstr :4358" to see the local process. From another machine, "nmap -p 4358 <host>" shows whether it is reachable.

05 Related
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