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Local dataset, no network
// Other services

Port 25001: icl-twobase2

Port 25001 is assigned by IANA to icl-twobase2 (icl-twobase2).

25001

How icl-twobase2 works

Other services
client:25001icl-twobase2response client:25001icl-twobase2response

The client sends a request to port 25001 and the icl-twobase2 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 25001 dangerous?

We have no specific security note for port 25001. 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 25001

ServicePortTransportDescriptionReferenceUpdated
icl-twobase2 25001 TCP, UDP icl-twobase2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 25001, and is it reachable?

Linux

sudo ss -ltnup 'sport = :25001'      # process listening on 25001
sudo lsof -nP -i :25001

macOS

sudo lsof -nP -i :25001

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 25001 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 25001
netstat -ano | findstr :25001

From another machine

nmap -p 25001 -sV <host>
sudo nmap -sU -p 25001 <host>
nc -zv <host> 25001

Block it in the firewall

sudo ufw deny 25001/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 25001" -Direction Inbound -LocalPort 25001 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 25001 used for?

Port 25001 is assigned by IANA to icl-twobase2 (icl-twobase2).

Is port 25001 TCP or UDP?

Port 25001 is registered for TCP and UDP.

Is it safe to open port 25001?

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 25001 is open?

On Linux run "ss -ltnup 'sport = :25001'", on macOS "lsof -nP -i :25001", and on Windows "netstat -ano | findstr :25001" to see the local process. From another machine, "nmap -p 25001 <host>" shows whether it is reachable.

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