CyberHunter
Local dataset, no network
// Other services

Port 542: commerce

Port 542 is assigned by IANA to commerce (commerce).

542

How commerce works

Other services
client:542commerceresponse client:542commerceresponse

The client sends a request to port 542 and the commerce 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 542 dangerous?

We have no specific security note for port 542. 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 542

ServicePortTransportDescriptionReferenceUpdated
commerce 542 TCP, UDP commerce - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 542, and is it reachable?

Linux

sudo ss -ltnup 'sport = :542'      # process listening on 542
sudo lsof -nP -i :542

macOS

sudo lsof -nP -i :542

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 542 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 542
netstat -ano | findstr :542

From another machine

nmap -p 542 -sV <host>
sudo nmap -sU -p 542 <host>
nc -zv <host> 542

Block it in the firewall

sudo ufw deny 542/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 542" -Direction Inbound -LocalPort 542 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 542 used for?

Port 542 is assigned by IANA to commerce (commerce).

Is port 542 TCP or UDP?

Port 542 is registered for TCP and UDP.

Is it safe to open port 542?

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 542 is open?

On Linux run "ss -ltnup 'sport = :542'", on macOS "lsof -nP -i :542", and on Windows "netstat -ano | findstr :542" to see the local process. From another machine, "nmap -p 542 <host>" shows whether it is reachable.

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