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// Other services

Port 4323: TRIM ICE Service

Port 4323 is assigned by IANA to trim-ice (TRIM ICE Service).

4323

How trim-ice works

Other services
client:4323trim-iceresponse client:4323trim-iceresponse

The client sends a request to port 4323 and the trim-ice 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 4323 dangerous?

We have no specific security note for port 4323. 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 4323

ServicePortTransportDescriptionReferenceUpdated
trim-ice 4323 TCP, UDP TRIM ICE Service - 2007-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 4323, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4323'      # process listening on 4323
sudo lsof -nP -i :4323

macOS

sudo lsof -nP -i :4323

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4323 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4323
netstat -ano | findstr :4323

From another machine

nmap -p 4323 -sV <host>
sudo nmap -sU -p 4323 <host>
nc -zv <host> 4323

Block it in the firewall

sudo ufw deny 4323/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4323" -Direction Inbound -LocalPort 4323 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4323 used for?

Port 4323 is assigned by IANA to trim-ice (TRIM ICE Service).

Is port 4323 TCP or UDP?

Port 4323 is registered for TCP and UDP.

Is it safe to open port 4323?

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 4323 is open?

On Linux run "ss -ltnup 'sport = :4323'", on macOS "lsof -nP -i :4323", and on Windows "netstat -ano | findstr :4323" to see the local process. From another machine, "nmap -p 4323 <host>" shows whether it is reachable.

05 Related
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