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// Other services

Port 3320: Office Link 2000

Port 3320 is assigned by IANA to officelink2000 (Office Link 2000).

3320

How officelink2000 works

Other services
client:3320officelink2000response client:3320officelink2000response

The client sends a request to port 3320 and the officelink2000 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 3320 dangerous?

We have no specific security note for port 3320. 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 3320

ServicePortTransportDescriptionReferenceUpdated
officelink2000 3320 TCP, UDP Office Link 2000 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3320, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3320'      # process listening on 3320
sudo lsof -nP -i :3320

macOS

sudo lsof -nP -i :3320

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3320 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3320
netstat -ano | findstr :3320

From another machine

nmap -p 3320 -sV <host>
sudo nmap -sU -p 3320 <host>
nc -zv <host> 3320

Block it in the firewall

sudo ufw deny 3320/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3320" -Direction Inbound -LocalPort 3320 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3320 used for?

Port 3320 is assigned by IANA to officelink2000 (Office Link 2000).

Is port 3320 TCP or UDP?

Port 3320 is registered for TCP and UDP.

Is it safe to open port 3320?

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 3320 is open?

On Linux run "ss -ltnup 'sport = :3320'", on macOS "lsof -nP -i :3320", and on Windows "netstat -ano | findstr :3320" to see the local process. From another machine, "nmap -p 3320 <host>" shows whether it is reachable.

05 Related
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