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// Other services

Port 3253: PDA Data

Port 3253 is assigned by IANA to pda-data (PDA Data).

3253

How pda-data works

Other services
client:3253pda-dataresponse client:3253pda-dataresponse

The client sends a request to port 3253 and the pda-data 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 3253 dangerous?

We have no specific security note for port 3253. 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 3253

ServicePortTransportDescriptionReferenceUpdated
pda-data 3253 TCP, UDP PDA Data - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3253, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3253'      # process listening on 3253
sudo lsof -nP -i :3253

macOS

sudo lsof -nP -i :3253

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3253 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3253
netstat -ano | findstr :3253

From another machine

nmap -p 3253 -sV <host>
sudo nmap -sU -p 3253 <host>
nc -zv <host> 3253

Block it in the firewall

sudo ufw deny 3253/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3253" -Direction Inbound -LocalPort 3253 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3253 used for?

Port 3253 is assigned by IANA to pda-data (PDA Data).

Is port 3253 TCP or UDP?

Port 3253 is registered for TCP and UDP.

Is it safe to open port 3253?

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 3253 is open?

On Linux run "ss -ltnup 'sport = :3253'", on macOS "lsof -nP -i :3253", and on Windows "netstat -ano | findstr :3253" to see the local process. From another machine, "nmap -p 3253 <host>" shows whether it is reachable.

05 Related
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