CyberHunter
Local dataset, no network
// Other services

Port 4837: Varadero-0

Port 4837 is assigned by IANA to varadero-0 (Varadero-0).

4837

How varadero-0 works

Other services
client:4837varadero-0response client:4837varadero-0response

The client sends a request to port 4837 and the varadero-0 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 4837 dangerous?

We have no specific security note for port 4837. 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 4837

ServicePortTransportDescriptionReferenceUpdated
varadero-0 4837 TCP, UDP Varadero-0 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4837, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4837'      # process listening on 4837
sudo lsof -nP -i :4837

macOS

sudo lsof -nP -i :4837

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4837 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4837
netstat -ano | findstr :4837

From another machine

nmap -p 4837 -sV <host>
sudo nmap -sU -p 4837 <host>
nc -zv <host> 4837

Block it in the firewall

sudo ufw deny 4837/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4837" -Direction Inbound -LocalPort 4837 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4837 used for?

Port 4837 is assigned by IANA to varadero-0 (Varadero-0).

Is port 4837 TCP or UDP?

Port 4837 is registered for TCP and UDP.

Is it safe to open port 4837?

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 4837 is open?

On Linux run "ss -ltnup 'sport = :4837'", on macOS "lsof -nP -i :4837", and on Windows "netstat -ano | findstr :4837" to see the local process. From another machine, "nmap -p 4837 <host>" shows whether it is reachable.

05 Related
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