Port 640
entrust-sps · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | entrust-sps |
Frequently asked questions
What is port 640 used for?
Port 640 is registered with the IANA for entrust-sps (TCP/UDP). Description: entrust-sps.
Is port 640 a well-known port?
Yes. Port 640 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 640 is open?
Locally on Linux with ss -tulpn | grep ':640\b', on Windows with netstat -ano | findstr :640. To test a remote host use Test-NetConnection <host> -Port 640 in PowerShell or nc -zv <host> 640 on Linux/macOS.
How do I open port 640 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 640/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=640/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 640" -Direction Inbound -Protocol TCP -LocalPort 640 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | entrust-sps | entrust-sps |
| UDP | entrust-sps | entrust-sps |