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Local dataset, no network
// Other services

Port 25003: icl-twobase4

Port 25003 is assigned by IANA to icl-twobase4 (icl-twobase4).

25003

How icl-twobase4 works

Other services
client:25003icl-twobase4response client:25003icl-twobase4response

The client sends a request to port 25003 and the icl-twobase4 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 25003 dangerous?

We have no specific security note for port 25003. 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 25003

ServicePortTransportDescriptionReferenceUpdated
icl-twobase4 25003 TCP, UDP icl-twobase4 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 25003, and is it reachable?

Linux

sudo ss -ltnup 'sport = :25003'      # process listening on 25003
sudo lsof -nP -i :25003

macOS

sudo lsof -nP -i :25003

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 25003 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 25003
netstat -ano | findstr :25003

From another machine

nmap -p 25003 -sV <host>
sudo nmap -sU -p 25003 <host>
nc -zv <host> 25003

Block it in the firewall

sudo ufw deny 25003/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 25003" -Direction Inbound -LocalPort 25003 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 25003 used for?

Port 25003 is assigned by IANA to icl-twobase4 (icl-twobase4).

Is port 25003 TCP or UDP?

Port 25003 is registered for TCP and UDP.

Is it safe to open port 25003?

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 25003 is open?

On Linux run "ss -ltnup 'sport = :25003'", on macOS "lsof -nP -i :25003", and on Windows "netstat -ano | findstr :25003" to see the local process. From another machine, "nmap -p 25003 <host>" shows whether it is reachable.

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