Port 621
escp-ip · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | escp-ip |
Frequently asked questions
What is port 621 used for?
Port 621 is registered with the IANA for escp-ip (TCP/UDP). Description: ESCP.
Is port 621 a well-known port?
Yes. Port 621 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 621 is open?
Locally on Linux with ss -tulpn | grep ':621\b', on Windows with netstat -ano | findstr :621. To test a remote host use Test-NetConnection <host> -Port 621 in PowerShell or nc -zv <host> 621 on Linux/macOS.
How do I open port 621 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 621/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=621/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 621" -Direction Inbound -Protocol TCP -LocalPort 621 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | escp-ip | ESCP |
| UDP | escp-ip | ESCP |