Port 3330

mcs-calypsoicf · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicemcs-calypsoicf

Frequently asked questions

What is port 3330 used for?

Port 3330 is registered with the IANA for mcs-calypsoicf (TCP/UDP). Description: MCS Calypso ICF.

Is port 3330 a well-known port?

No. Port 3330 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 3330 is open?

Locally on Linux with ss -tulpn | grep ':3330\b', on Windows with netstat -ano | findstr :3330. To test a remote host use Test-NetConnection <host> -Port 3330 in PowerShell or nc -zv <host> 3330 on Linux/macOS.

How do I open port 3330 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 3330/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3330/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3330" -Direction Inbound -Protocol TCP -LocalPort 3330 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPmcs-calypsoicfMCS Calypso ICF
UDPmcs-calypsoicfMCS Calypso ICF

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