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// Other services

Port 5242: ATTUne API

Port 5242 is assigned by IANA to attune (ATTUne API).

5242

How attune works

Other services
client:5242attuneresponse client:5242attuneresponse

The client sends a request to port 5242 and the attune 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 5242 dangerous?

We have no specific security note for port 5242. 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 5242

ServicePortTransportDescriptionReferenceUpdated
attune 5242 TCP ATTUne API - 2022-06-01
-5242-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5242, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5242'      # process listening on 5242
sudo lsof -nP -i :5242

macOS

sudo lsof -nP -i :5242

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5242 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5242
netstat -ano | findstr :5242

From another machine

nmap -p 5242 -sV <host>
nc -zv <host> 5242

Block it in the firewall

sudo ufw deny 5242/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5242" -Direction Inbound -LocalPort 5242 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5242 used for?

Port 5242 is assigned by IANA to attune (ATTUne API).

Is port 5242 TCP or UDP?

Port 5242 is registered for TCP.

Is it safe to open port 5242?

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 5242 is open?

On Linux run "ss -ltnup 'sport = :5242'", on macOS "lsof -nP -i :5242", and on Windows "netstat -ano | findstr :5242" to see the local process. From another machine, "nmap -p 5242 <host>" shows whether it is reachable.

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