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// Other services

Port 3315: CDID

Port 3315 is assigned by IANA to cdid (CDID).

3315

How cdid works

Other services
client:3315cdidresponse client:3315cdidresponse

The client sends a request to port 3315 and the cdid 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 3315 dangerous?

We have no specific security note for port 3315. 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 3315

ServicePortTransportDescriptionReferenceUpdated
cdid 3315 TCP, UDP CDID - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3315, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3315'      # process listening on 3315
sudo lsof -nP -i :3315

macOS

sudo lsof -nP -i :3315

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3315 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3315
netstat -ano | findstr :3315

From another machine

nmap -p 3315 -sV <host>
sudo nmap -sU -p 3315 <host>
nc -zv <host> 3315

Block it in the firewall

sudo ufw deny 3315/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3315" -Direction Inbound -LocalPort 3315 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3315 used for?

Port 3315 is assigned by IANA to cdid (CDID).

Is port 3315 TCP or UDP?

Port 3315 is registered for TCP and UDP.

Is it safe to open port 3315?

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 3315 is open?

On Linux run "ss -ltnup 'sport = :3315'", on macOS "lsof -nP -i :3315", and on Windows "netstat -ano | findstr :3315" to see the local process. From another machine, "nmap -p 3315 <host>" shows whether it is reachable.

05 Related
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