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// Other services

Port 3330: MCS Calypso ICF

Port 3330 is assigned by IANA to mcs-calypsoicf (MCS Calypso ICF).

3330

How mcs-calypsoicf works

Other services
client:3330mcs-calypsoicfresponse client:3330mcs-calypsoicfresponse

The client sends a request to port 3330 and the mcs-calypsoicf 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 3330 dangerous?

We have no specific security note for port 3330. 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 3330

ServicePortTransportDescriptionReferenceUpdated
mcs-calypsoicf 3330 TCP, UDP MCS Calypso ICF - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3330, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3330'      # process listening on 3330
sudo lsof -nP -i :3330

macOS

sudo lsof -nP -i :3330

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3330 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3330
netstat -ano | findstr :3330

From another machine

nmap -p 3330 -sV <host>
sudo nmap -sU -p 3330 <host>
nc -zv <host> 3330

Block it in the firewall

sudo ufw deny 3330/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3330" -Direction Inbound -LocalPort 3330 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3330 used for?

Port 3330 is assigned by IANA to mcs-calypsoicf (MCS Calypso ICF).

Is port 3330 TCP or UDP?

Port 3330 is registered for TCP and UDP.

Is it safe to open port 3330?

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 3330 is open?

On Linux run "ss -ltnup 'sport = :3330'", on macOS "lsof -nP -i :3330", and on Windows "netstat -ano | findstr :3330" to see the local process. From another machine, "nmap -p 3330 <host>" shows whether it is reachable.

05 Related
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