CyberHunter
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// Other services

Port 392: SynOptics Port Broker Port

Port 392 is assigned by IANA to synotics-broker (SynOptics Port Broker Port).

392

How synotics-broker works

Other services
client:392synotics-brokerresponse client:392synotics-brokerresponse

The client sends a request to port 392 and the synotics-broker 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 392 dangerous?

We have no specific security note for port 392. 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 392

ServicePortTransportDescriptionReferenceUpdated
synotics-broker 392 TCP, UDP SynOptics Port Broker Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 392, and is it reachable?

Linux

sudo ss -ltnup 'sport = :392'      # process listening on 392
sudo lsof -nP -i :392

macOS

sudo lsof -nP -i :392

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 392 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 392
netstat -ano | findstr :392

From another machine

nmap -p 392 -sV <host>
sudo nmap -sU -p 392 <host>
nc -zv <host> 392

Block it in the firewall

sudo ufw deny 392/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 392" -Direction Inbound -LocalPort 392 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 392 used for?

Port 392 is assigned by IANA to synotics-broker (SynOptics Port Broker Port).

Is port 392 TCP or UDP?

Port 392 is registered for TCP and UDP.

Is it safe to open port 392?

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 392 is open?

On Linux run "ss -ltnup 'sport = :392'", on macOS "lsof -nP -i :392", and on Windows "netstat -ano | findstr :392" to see the local process. From another machine, "nmap -p 392 <host>" shows whether it is reachable.

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