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// Other services

Port 6558:

Port 6558 is assigned by IANA to xdsxdm ().

6558

How xdsxdm works

Other services
client:6558xdsxdmresponse client:6558xdsxdmresponse

The client sends a request to port 6558 and the xdsxdm 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 6558 dangerous?

We have no specific security note for port 6558. 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 6558

ServicePortTransportDescriptionReferenceUpdated
xdsxdm 6558 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6558, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6558'      # process listening on 6558
sudo lsof -nP -i :6558

macOS

sudo lsof -nP -i :6558

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6558 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6558
netstat -ano | findstr :6558

From another machine

nmap -p 6558 -sV <host>
sudo nmap -sU -p 6558 <host>
nc -zv <host> 6558

Block it in the firewall

sudo ufw deny 6558/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6558" -Direction Inbound -LocalPort 6558 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6558 used for?

Port 6558 is assigned by IANA to xdsxdm ().

Is port 6558 TCP or UDP?

Port 6558 is registered for TCP and UDP.

Is it safe to open port 6558?

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 6558 is open?

On Linux run "ss -ltnup 'sport = :6558'", on macOS "lsof -nP -i :6558", and on Windows "netstat -ano | findstr :6558" to see the local process. From another machine, "nmap -p 6558 <host>" shows whether it is reachable.

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