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// Other services

Port 3489: DTP/DIA

Port 3489 is assigned by IANA to dtp-dia (DTP/DIA).

3489

How dtp-dia works

Other services
client:3489dtp-diaresponse client:3489dtp-diaresponse

The client sends a request to port 3489 and the dtp-dia 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 3489 dangerous?

We have no specific security note for port 3489. 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 3489

ServicePortTransportDescriptionReferenceUpdated
dtp-dia 3489 TCP, UDP DTP/DIA - 2002-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 3489, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3489'      # process listening on 3489
sudo lsof -nP -i :3489

macOS

sudo lsof -nP -i :3489

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3489 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3489
netstat -ano | findstr :3489

From another machine

nmap -p 3489 -sV <host>
sudo nmap -sU -p 3489 <host>
nc -zv <host> 3489

Block it in the firewall

sudo ufw deny 3489/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3489" -Direction Inbound -LocalPort 3489 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3489 used for?

Port 3489 is assigned by IANA to dtp-dia (DTP/DIA).

Is port 3489 TCP or UDP?

Port 3489 is registered for TCP and UDP.

Is it safe to open port 3489?

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 3489 is open?

On Linux run "ss -ltnup 'sport = :3489'", on macOS "lsof -nP -i :3489", and on Windows "netstat -ano | findstr :3489" to see the local process. From another machine, "nmap -p 3489 <host>" shows whether it is reachable.

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