CyberHunter
Local dataset, no network
// Other services

Port 25903: NIProbe

Port 25903 is assigned by IANA to niprobe (NIProbe).

25903

How niprobe works

Other services
client:25903niproberesponse client:25903niproberesponse

The client sends a request to port 25903 and the niprobe 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 25903 dangerous?

We have no specific security note for port 25903. 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 25903

ServicePortTransportDescriptionReferenceUpdated
niprobe 25903 TCP, UDP NIProbe - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 25903, and is it reachable?

Linux

sudo ss -ltnup 'sport = :25903'      # process listening on 25903
sudo lsof -nP -i :25903

macOS

sudo lsof -nP -i :25903

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 25903 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 25903
netstat -ano | findstr :25903

From another machine

nmap -p 25903 -sV <host>
sudo nmap -sU -p 25903 <host>
nc -zv <host> 25903

Block it in the firewall

sudo ufw deny 25903/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 25903" -Direction Inbound -LocalPort 25903 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 25903 used for?

Port 25903 is assigned by IANA to niprobe (NIProbe).

Is port 25903 TCP or UDP?

Port 25903 is registered for TCP and UDP.

Is it safe to open port 25903?

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 25903 is open?

On Linux run "ss -ltnup 'sport = :25903'", on macOS "lsof -nP -i :25903", and on Windows "netstat -ano | findstr :25903" to see the local process. From another machine, "nmap -p 25903 <host>" shows whether it is reachable.

05 Related
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