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// Other services

Port 3388: CB Server

Port 3388 is assigned by IANA to cbserver (CB Server).

3388

How cbserver works

Other services
client:3388cbserverresponse client:3388cbserverresponse

The client sends a request to port 3388 and the cbserver 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 3388 dangerous?

We have no specific security note for port 3388. 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 3388

ServicePortTransportDescriptionReferenceUpdated
cbserver 3388 TCP, UDP CB Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3388, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3388'      # process listening on 3388
sudo lsof -nP -i :3388

macOS

sudo lsof -nP -i :3388

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3388 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3388
netstat -ano | findstr :3388

From another machine

nmap -p 3388 -sV <host>
sudo nmap -sU -p 3388 <host>
nc -zv <host> 3388

Block it in the firewall

sudo ufw deny 3388/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3388" -Direction Inbound -LocalPort 3388 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3388 used for?

Port 3388 is assigned by IANA to cbserver (CB Server).

Is port 3388 TCP or UDP?

Port 3388 is registered for TCP and UDP.

Is it safe to open port 3388?

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 3388 is open?

On Linux run "ss -ltnup 'sport = :3388'", on macOS "lsof -nP -i :3388", and on Windows "netstat -ano | findstr :3388" to see the local process. From another machine, "nmap -p 3388 <host>" shows whether it is reachable.

05 Related
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