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// Other services

Port 642: ESRO-EMSDP V1.3

Port 642 is assigned by IANA to esro-emsdp (ESRO-EMSDP V1.3).

642

How esro-emsdp works

Other services
client:642esro-emsdpresponse client:642esro-emsdpresponse

The client sends a request to port 642 and the esro-emsdp 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 642 dangerous?

We have no specific security note for port 642. 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 642

ServicePortTransportDescriptionReferenceUpdated
esro-emsdp 642 TCP, UDP ESRO-EMSDP V1.3 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 642, and is it reachable?

Linux

sudo ss -ltnup 'sport = :642'      # process listening on 642
sudo lsof -nP -i :642

macOS

sudo lsof -nP -i :642

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 642 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 642
netstat -ano | findstr :642

From another machine

nmap -p 642 -sV <host>
sudo nmap -sU -p 642 <host>
nc -zv <host> 642

Block it in the firewall

sudo ufw deny 642/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 642" -Direction Inbound -LocalPort 642 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 642 used for?

Port 642 is assigned by IANA to esro-emsdp (ESRO-EMSDP V1.3).

Is port 642 TCP or UDP?

Port 642 is registered for TCP and UDP.

Is it safe to open port 642?

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 642 is open?

On Linux run "ss -ltnup 'sport = :642'", on macOS "lsof -nP -i :642", and on Windows "netstat -ano | findstr :642" to see the local process. From another machine, "nmap -p 642 <host>" shows whether it is reachable.

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