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// Other services

Port 4374: PSI Push-to-Talk Protocol

Port 4374 is assigned by IANA to psi-ptt (PSI Push-to-Talk Protocol).

4374

How psi-ptt works

Other services
client:4374psi-pttresponse client:4374psi-pttresponse

The client sends a request to port 4374 and the psi-ptt service answers.

Transport
TCP
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 4374 dangerous?

We have no specific security note for port 4374. 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 4374

ServicePortTransportDescriptionReferenceUpdated
psi-ptt 4374 TCP PSI Push-to-Talk Protocol - 2008-07-17
-4374-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4374, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4374'      # process listening on 4374
sudo lsof -nP -i :4374

macOS

sudo lsof -nP -i :4374

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4374 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4374
netstat -ano | findstr :4374

From another machine

nmap -p 4374 -sV <host>
nc -zv <host> 4374

Block it in the firewall

sudo ufw deny 4374/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4374" -Direction Inbound -LocalPort 4374 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4374 used for?

Port 4374 is assigned by IANA to psi-ptt (PSI Push-to-Talk Protocol).

Is port 4374 TCP or UDP?

Port 4374 is registered for TCP.

Is it safe to open port 4374?

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 4374 is open?

On Linux run "ss -ltnup 'sport = :4374'", on macOS "lsof -nP -i :4374", and on Windows "netstat -ano | findstr :4374" to see the local process. From another machine, "nmap -p 4374 <host>" shows whether it is reachable.

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