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// Other services

Port 640: entrust-sps

Port 640 is assigned by IANA to entrust-sps (entrust-sps).

640

How entrust-sps works

Other services
client:640entrust-spsresponse client:640entrust-spsresponse

The client sends a request to port 640 and the entrust-sps 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 640 dangerous?

We have no specific security note for port 640. 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 640

ServicePortTransportDescriptionReferenceUpdated
entrust-sps 640 TCP, UDP entrust-sps - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 640, and is it reachable?

Linux

sudo ss -ltnup 'sport = :640'      # process listening on 640
sudo lsof -nP -i :640

macOS

sudo lsof -nP -i :640

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 640 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 640
netstat -ano | findstr :640

From another machine

nmap -p 640 -sV <host>
sudo nmap -sU -p 640 <host>
nc -zv <host> 640

Block it in the firewall

sudo ufw deny 640/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 640" -Direction Inbound -LocalPort 640 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 640 used for?

Port 640 is assigned by IANA to entrust-sps (entrust-sps).

Is port 640 TCP or UDP?

Port 640 is registered for TCP and UDP.

Is it safe to open port 640?

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 640 is open?

On Linux run "ss -ltnup 'sport = :640'", on macOS "lsof -nP -i :640", and on Windows "netstat -ano | findstr :640" to see the local process. From another machine, "nmap -p 640 <host>" shows whether it is reachable.

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