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// Other services

Port 645: PSSC

Port 645 is assigned by IANA to pssc (PSSC).

645

How pssc works

Other services
client:645psscresponse client:645psscresponse

The client sends a request to port 645 and the pssc 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 645 dangerous?

We have no specific security note for port 645. 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 645

ServicePortTransportDescriptionReferenceUpdated
pssc 645 TCP, UDP PSSC - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 645, and is it reachable?

Linux

sudo ss -ltnup 'sport = :645'      # process listening on 645
sudo lsof -nP -i :645

macOS

sudo lsof -nP -i :645

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 645 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 645
netstat -ano | findstr :645

From another machine

nmap -p 645 -sV <host>
sudo nmap -sU -p 645 <host>
nc -zv <host> 645

Block it in the firewall

sudo ufw deny 645/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 645" -Direction Inbound -LocalPort 645 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 645 used for?

Port 645 is assigned by IANA to pssc (PSSC).

Is port 645 TCP or UDP?

Port 645 is registered for TCP and UDP.

Is it safe to open port 645?

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 645 is open?

On Linux run "ss -ltnup 'sport = :645'", on macOS "lsof -nP -i :645", and on Windows "netstat -ano | findstr :645" to see the local process. From another machine, "nmap -p 645 <host>" shows whether it is reachable.

05 Related
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