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// Other services

Port 9640: ProQueSys Flows Service

Port 9640 is assigned by IANA to pqsflows (ProQueSys Flows Service).

9640

How pqsflows works

Other services
client:9640pqsflowsresponse client:9640pqsflowsresponse

The client sends a request to port 9640 and the pqsflows service answers.

Transport
TCP
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 9640 dangerous?

We have no specific security note for port 9640. 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 9640

ServicePortTransportDescriptionReferenceUpdated
pqsflows 9640 TCP ProQueSys Flows Service - 2010-04-27
-9640-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 9640, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9640'      # process listening on 9640
sudo lsof -nP -i :9640

macOS

sudo lsof -nP -i :9640

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9640 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9640
netstat -ano | findstr :9640

From another machine

nmap -p 9640 -sV <host>
nc -zv <host> 9640

Block it in the firewall

sudo ufw deny 9640/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9640" -Direction Inbound -LocalPort 9640 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9640 used for?

Port 9640 is assigned by IANA to pqsflows (ProQueSys Flows Service).

Is port 9640 TCP or UDP?

Port 9640 is registered for TCP.

Is it safe to open port 9640?

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 9640 is open?

On Linux run "ss -ltnup 'sport = :9640'", on macOS "lsof -nP -i :9640", and on Windows "netstat -ano | findstr :9640" to see the local process. From another machine, "nmap -p 9640 <host>" shows whether it is reachable.

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