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// Other services

Port 3254: PDA System

Port 3254 is assigned by IANA to pda-sys (PDA System).

3254

How pda-sys works

Other services
client:3254pda-sysresponse client:3254pda-sysresponse

The client sends a request to port 3254 and the pda-sys 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 3254 dangerous?

We have no specific security note for port 3254. 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 3254

ServicePortTransportDescriptionReferenceUpdated
pda-sys 3254 TCP, UDP PDA System - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3254, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3254'      # process listening on 3254
sudo lsof -nP -i :3254

macOS

sudo lsof -nP -i :3254

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3254 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3254
netstat -ano | findstr :3254

From another machine

nmap -p 3254 -sV <host>
sudo nmap -sU -p 3254 <host>
nc -zv <host> 3254

Block it in the firewall

sudo ufw deny 3254/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3254" -Direction Inbound -LocalPort 3254 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3254 used for?

Port 3254 is assigned by IANA to pda-sys (PDA System).

Is port 3254 TCP or UDP?

Port 3254 is registered for TCP and UDP.

Is it safe to open port 3254?

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 3254 is open?

On Linux run "ss -ltnup 'sport = :3254'", on macOS "lsof -nP -i :3254", and on Windows "netstat -ano | findstr :3254" to see the local process. From another machine, "nmap -p 3254 <host>" shows whether it is reachable.

05 Related
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