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// Other services

Port 4838: Varadero-1

Port 4838 is assigned by IANA to varadero-1 (Varadero-1).

4838

How varadero-1 works

Other services
client:4838varadero-1response client:4838varadero-1response

The client sends a request to port 4838 and the varadero-1 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 4838 dangerous?

We have no specific security note for port 4838. 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 4838

ServicePortTransportDescriptionReferenceUpdated
varadero-1 4838 TCP, UDP Varadero-1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4838, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4838'      # process listening on 4838
sudo lsof -nP -i :4838

macOS

sudo lsof -nP -i :4838

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4838 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4838
netstat -ano | findstr :4838

From another machine

nmap -p 4838 -sV <host>
sudo nmap -sU -p 4838 <host>
nc -zv <host> 4838

Block it in the firewall

sudo ufw deny 4838/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4838" -Direction Inbound -LocalPort 4838 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4838 used for?

Port 4838 is assigned by IANA to varadero-1 (Varadero-1).

Is port 4838 TCP or UDP?

Port 4838 is registered for TCP and UDP.

Is it safe to open port 4838?

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 4838 is open?

On Linux run "ss -ltnup 'sport = :4838'", on macOS "lsof -nP -i :4838", and on Windows "netstat -ano | findstr :4838" to see the local process. From another machine, "nmap -p 4838 <host>" shows whether it is reachable.

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