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// Other services

Port 432: IASD

Port 432 is assigned by IANA to iasd (IASD).

432

How iasd works

Other services
client:432iasdresponse client:432iasdresponse

The client sends a request to port 432 and the iasd 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 432 dangerous?

We have no specific security note for port 432. 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 432

ServicePortTransportDescriptionReferenceUpdated
iasd 432 TCP, UDP IASD - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 432, and is it reachable?

Linux

sudo ss -ltnup 'sport = :432'      # process listening on 432
sudo lsof -nP -i :432

macOS

sudo lsof -nP -i :432

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 432 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 432
netstat -ano | findstr :432

From another machine

nmap -p 432 -sV <host>
sudo nmap -sU -p 432 <host>
nc -zv <host> 432

Block it in the firewall

sudo ufw deny 432/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 432" -Direction Inbound -LocalPort 432 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 432 used for?

Port 432 is assigned by IANA to iasd (IASD).

Is port 432 TCP or UDP?

Port 432 is registered for TCP and UDP.

Is it safe to open port 432?

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 432 is open?

On Linux run "ss -ltnup 'sport = :432'", on macOS "lsof -nP -i :432", and on Windows "netstat -ano | findstr :432" to see the local process. From another machine, "nmap -p 432 <host>" shows whether it is reachable.

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