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// Other services

Port 4876: Tritium CAN Bus Bridge Service

Port 4876 is assigned by IANA to tritium-can (Tritium CAN Bus Bridge Service).

4876

How tritium-can works

Other services
client:4876tritium-canresponse client:4876tritium-canresponse

The client sends a request to port 4876 and the tritium-can 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 4876 dangerous?

We have no specific security note for port 4876. 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 4876

ServicePortTransportDescriptionReferenceUpdated
tritium-can 4876 TCP, UDP Tritium CAN Bus Bridge Service - 2011-02-15

// source: IANA service name and port number registry

03 Check it

Which program uses port 4876, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4876'      # process listening on 4876
sudo lsof -nP -i :4876

macOS

sudo lsof -nP -i :4876

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4876 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4876
netstat -ano | findstr :4876

From another machine

nmap -p 4876 -sV <host>
sudo nmap -sU -p 4876 <host>
nc -zv <host> 4876

Block it in the firewall

sudo ufw deny 4876/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4876" -Direction Inbound -LocalPort 4876 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4876 used for?

Port 4876 is assigned by IANA to tritium-can (Tritium CAN Bus Bridge Service).

Is port 4876 TCP or UDP?

Port 4876 is registered for TCP and UDP.

Is it safe to open port 4876?

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 4876 is open?

On Linux run "ss -ltnup 'sport = :4876'", on macOS "lsof -nP -i :4876", and on Windows "netstat -ano | findstr :4876" to see the local process. From another machine, "nmap -p 4876 <host>" shows whether it is reachable.

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