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// Other services

Port 5883: Javascript Unit Test Environment

Port 5883 is assigned by IANA to jute (Javascript Unit Test Environment).

5883

How jute works

Other services
client:5883juteresponse client:5883juteresponse

The client sends a request to port 5883 and the jute service answers.

Transport
TCP
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 5883 dangerous?

We have no specific security note for port 5883. 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 5883

ServicePortTransportDescriptionReferenceUpdated
jute 5883 TCP Javascript Unit Test Environment - 2011-11-23

// source: IANA service name and port number registry

03 Check it

Which program uses port 5883, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5883'      # process listening on 5883
sudo lsof -nP -i :5883

macOS

sudo lsof -nP -i :5883

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5883 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5883
netstat -ano | findstr :5883

From another machine

nmap -p 5883 -sV <host>
nc -zv <host> 5883

Block it in the firewall

sudo ufw deny 5883/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5883" -Direction Inbound -LocalPort 5883 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5883 used for?

Port 5883 is assigned by IANA to jute (Javascript Unit Test Environment).

Is port 5883 TCP or UDP?

Port 5883 is registered for TCP.

Is it safe to open port 5883?

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 5883 is open?

On Linux run "ss -ltnup 'sport = :5883'", on macOS "lsof -nP -i :5883", and on Windows "netstat -ano | findstr :5883" to see the local process. From another machine, "nmap -p 5883 <host>" shows whether it is reachable.

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