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// Other services

Port 4024: TNP1 User Port

Port 4024 is assigned by IANA to tnp1-port (TNP1 User Port).

4024

How tnp1-port works

Other services
client:4024tnp1-portresponse client:4024tnp1-portresponse

The client sends a request to port 4024 and the tnp1-port 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 4024 dangerous?

We have no specific security note for port 4024. 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 4024

ServicePortTransportDescriptionReferenceUpdated
tnp1-port 4024 TCP, UDP TNP1 User Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4024, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4024'      # process listening on 4024
sudo lsof -nP -i :4024

macOS

sudo lsof -nP -i :4024

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4024 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4024
netstat -ano | findstr :4024

From another machine

nmap -p 4024 -sV <host>
sudo nmap -sU -p 4024 <host>
nc -zv <host> 4024

Block it in the firewall

sudo ufw deny 4024/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4024" -Direction Inbound -LocalPort 4024 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4024 used for?

Port 4024 is assigned by IANA to tnp1-port (TNP1 User Port).

Is port 4024 TCP or UDP?

Port 4024 is registered for TCP and UDP.

Is it safe to open port 4024?

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 4024 is open?

On Linux run "ss -ltnup 'sport = :4024'", on macOS "lsof -nP -i :4024", and on Windows "netstat -ano | findstr :4024" to see the local process. From another machine, "nmap -p 4024 <host>" shows whether it is reachable.

05 Related
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