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// Other services

Port 25004: icl-twobase5

Port 25004 is assigned by IANA to icl-twobase5 (icl-twobase5).

25004

How icl-twobase5 works

Other services
client:25004icl-twobase5response client:25004icl-twobase5response

The client sends a request to port 25004 and the icl-twobase5 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 25004 dangerous?

We have no specific security note for port 25004. 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 25004

ServicePortTransportDescriptionReferenceUpdated
icl-twobase5 25004 TCP, UDP icl-twobase5 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 25004, and is it reachable?

Linux

sudo ss -ltnup 'sport = :25004'      # process listening on 25004
sudo lsof -nP -i :25004

macOS

sudo lsof -nP -i :25004

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 25004 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 25004
netstat -ano | findstr :25004

From another machine

nmap -p 25004 -sV <host>
sudo nmap -sU -p 25004 <host>
nc -zv <host> 25004

Block it in the firewall

sudo ufw deny 25004/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 25004" -Direction Inbound -LocalPort 25004 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 25004 used for?

Port 25004 is assigned by IANA to icl-twobase5 (icl-twobase5).

Is port 25004 TCP or UDP?

Port 25004 is registered for TCP and UDP.

Is it safe to open port 25004?

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 25004 is open?

On Linux run "ss -ltnup 'sport = :25004'", on macOS "lsof -nP -i :25004", and on Windows "netstat -ano | findstr :25004" to see the local process. From another machine, "nmap -p 25004 <host>" shows whether it is reachable.

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