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// Other services

Port 3680: NPDS Tracker

Port 3680 is assigned by IANA to npds-tracker (NPDS Tracker).

3680

How npds-tracker works

Other services
client:3680npds-trackerresponse client:3680npds-trackerresponse

The client sends a request to port 3680 and the npds-tracker 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 3680 dangerous?

We have no specific security note for port 3680. 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 3680

ServicePortTransportDescriptionReferenceUpdated
npds-tracker 3680 TCP, UDP NPDS Tracker - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3680, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3680'      # process listening on 3680
sudo lsof -nP -i :3680

macOS

sudo lsof -nP -i :3680

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3680 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3680
netstat -ano | findstr :3680

From another machine

nmap -p 3680 -sV <host>
sudo nmap -sU -p 3680 <host>
nc -zv <host> 3680

Block it in the firewall

sudo ufw deny 3680/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3680" -Direction Inbound -LocalPort 3680 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3680 used for?

Port 3680 is assigned by IANA to npds-tracker (NPDS Tracker).

Is port 3680 TCP or UDP?

Port 3680 is registered for TCP and UDP.

Is it safe to open port 3680?

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 3680 is open?

On Linux run "ss -ltnup 'sport = :3680'", on macOS "lsof -nP -i :3680", and on Windows "netstat -ano | findstr :3680" to see the local process. From another machine, "nmap -p 3680 <host>" shows whether it is reachable.

05 Related
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