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// Other services

Port 2538: vnwk-prapi

Port 2538 is assigned by IANA to vnwk-prapi (vnwk-prapi).

2538

How vnwk-prapi works

Other services
client:2538vnwk-prapiresponse client:2538vnwk-prapiresponse

The client sends a request to port 2538 and the vnwk-prapi 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 2538 dangerous?

We have no specific security note for port 2538. 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 2538

ServicePortTransportDescriptionReferenceUpdated
vnwk-prapi 2538 TCP, UDP vnwk-prapi - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2538, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2538'      # process listening on 2538
sudo lsof -nP -i :2538

macOS

sudo lsof -nP -i :2538

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2538 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2538
netstat -ano | findstr :2538

From another machine

nmap -p 2538 -sV <host>
sudo nmap -sU -p 2538 <host>
nc -zv <host> 2538

Block it in the firewall

sudo ufw deny 2538/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2538" -Direction Inbound -LocalPort 2538 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2538 used for?

Port 2538 is assigned by IANA to vnwk-prapi (vnwk-prapi).

Is port 2538 TCP or UDP?

Port 2538 is registered for TCP and UDP.

Is it safe to open port 2538?

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 2538 is open?

On Linux run "ss -ltnup 'sport = :2538'", on macOS "lsof -nP -i :2538", and on Windows "netstat -ano | findstr :2538" to see the local process. From another machine, "nmap -p 2538 <host>" shows whether it is reachable.

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