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// Other services

Port 425: ICAD

Port 425 is assigned by IANA to icad-el (ICAD).

425

How icad-el works

Other services
client:425icad-elresponse client:425icad-elresponse

The client sends a request to port 425 and the icad-el 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 425 dangerous?

We have no specific security note for port 425. 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 425

ServicePortTransportDescriptionReferenceUpdated
icad-el 425 TCP, UDP ICAD - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 425, and is it reachable?

Linux

sudo ss -ltnup 'sport = :425'      # process listening on 425
sudo lsof -nP -i :425

macOS

sudo lsof -nP -i :425

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 425 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 425
netstat -ano | findstr :425

From another machine

nmap -p 425 -sV <host>
sudo nmap -sU -p 425 <host>
nc -zv <host> 425

Block it in the firewall

sudo ufw deny 425/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 425" -Direction Inbound -LocalPort 425 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 425 used for?

Port 425 is assigned by IANA to icad-el (ICAD).

Is port 425 TCP or UDP?

Port 425 is registered for TCP and UDP.

Is it safe to open port 425?

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 425 is open?

On Linux run "ss -ltnup 'sport = :425'", on macOS "lsof -nP -i :425", and on Windows "netstat -ano | findstr :425" to see the local process. From another machine, "nmap -p 425 <host>" shows whether it is reachable.

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