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// Other services

Port 17225: Train Realtime Data Protocol (TRDP) Message Data

Port 17225 is assigned by IANA to trdp-md (Train Realtime Data Protocol (TRDP) Message Data).

17225

How trdp-md works

Other services
client:17225trdp-mdresponse client:17225trdp-mdresponse

The client sends a request to port 17225 and the trdp-md 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 17225 dangerous?

We have no specific security note for port 17225. 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 17225

ServicePortTransportDescriptionReferenceUpdated
trdp-md 17225 TCP, UDP Train Realtime Data Protocol (TRDP) Message Data - 2015-07-24

// source: IANA service name and port number registry

03 Check it

Which program uses port 17225, and is it reachable?

Linux

sudo ss -ltnup 'sport = :17225'      # process listening on 17225
sudo lsof -nP -i :17225

macOS

sudo lsof -nP -i :17225

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 17225 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 17225
netstat -ano | findstr :17225

From another machine

nmap -p 17225 -sV <host>
sudo nmap -sU -p 17225 <host>
nc -zv <host> 17225

Block it in the firewall

sudo ufw deny 17225/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 17225" -Direction Inbound -LocalPort 17225 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 17225 used for?

Port 17225 is assigned by IANA to trdp-md (Train Realtime Data Protocol (TRDP) Message Data).

Is port 17225 TCP or UDP?

Port 17225 is registered for TCP and UDP.

Is it safe to open port 17225?

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 17225 is open?

On Linux run "ss -ltnup 'sport = :17225'", on macOS "lsof -nP -i :17225", and on Windows "netstat -ano | findstr :17225" to see the local process. From another machine, "nmap -p 17225 <host>" shows whether it is reachable.

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