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// Other services

Port 4028: DTServer Port

Port 4028 is assigned by IANA to dtserver-port (DTServer Port).

4028

How dtserver-port works

Other services
client:4028dtserver-portresponse client:4028dtserver-portresponse

The client sends a request to port 4028 and the dtserver-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 4028 dangerous?

We have no specific security note for port 4028. 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 4028

ServicePortTransportDescriptionReferenceUpdated
dtserver-port 4028 TCP, UDP DTServer Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4028, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4028'      # process listening on 4028
sudo lsof -nP -i :4028

macOS

sudo lsof -nP -i :4028

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4028 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4028
netstat -ano | findstr :4028

From another machine

nmap -p 4028 -sV <host>
sudo nmap -sU -p 4028 <host>
nc -zv <host> 4028

Block it in the firewall

sudo ufw deny 4028/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4028" -Direction Inbound -LocalPort 4028 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4028 used for?

Port 4028 is assigned by IANA to dtserver-port (DTServer Port).

Is port 4028 TCP or UDP?

Port 4028 is registered for TCP and UDP.

Is it safe to open port 4028?

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 4028 is open?

On Linux run "ss -ltnup 'sport = :4028'", on macOS "lsof -nP -i :4028", and on Windows "netstat -ano | findstr :4028" to see the local process. From another machine, "nmap -p 4028 <host>" shows whether it is reachable.

05 Related
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