CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 25604: Identifier Tracing Protocol

Port 25604 is assigned by IANA to idtp (Identifier Tracing Protocol).

25604

How idtp works

Other services
client:25604idtpresponse client:25604idtpresponse

The client sends a request to port 25604 and the idtp service answers.

Transport
TCP
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 25604 dangerous?

We have no specific security note for port 25604. 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 25604

ServicePortTransportDescriptionReferenceUpdated
idtp 25604 TCP Identifier Tracing Protocol - 2011-08-09
-25604-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 25604, and is it reachable?

Linux

sudo ss -ltnup 'sport = :25604'      # process listening on 25604
sudo lsof -nP -i :25604

macOS

sudo lsof -nP -i :25604

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 25604 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 25604
netstat -ano | findstr :25604

From another machine

nmap -p 25604 -sV <host>
nc -zv <host> 25604

Block it in the firewall

sudo ufw deny 25604/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 25604" -Direction Inbound -LocalPort 25604 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 25604 used for?

Port 25604 is assigned by IANA to idtp (Identifier Tracing Protocol).

Is port 25604 TCP or UDP?

Port 25604 is registered for TCP.

Is it safe to open port 25604?

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 25604 is open?

On Linux run "ss -ltnup 'sport = :25604'", on macOS "lsof -nP -i :25604", and on Windows "netstat -ano | findstr :25604" to see the local process. From another machine, "nmap -p 25604 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news