CyberHunter
Local dataset, no network
// Other services

Port 2566: pcs-pcw

Port 2566 is assigned by IANA to pcs-pcw (pcs-pcw).

2566

How pcs-pcw works

Other services
client:2566pcs-pcwresponse client:2566pcs-pcwresponse

The client sends a request to port 2566 and the pcs-pcw 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 2566 dangerous?

We have no specific security note for port 2566. 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 2566

ServicePortTransportDescriptionReferenceUpdated
pcs-pcw 2566 TCP, UDP pcs-pcw - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2566, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2566'      # process listening on 2566
sudo lsof -nP -i :2566

macOS

sudo lsof -nP -i :2566

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2566 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2566
netstat -ano | findstr :2566

From another machine

nmap -p 2566 -sV <host>
sudo nmap -sU -p 2566 <host>
nc -zv <host> 2566

Block it in the firewall

sudo ufw deny 2566/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2566" -Direction Inbound -LocalPort 2566 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2566 used for?

Port 2566 is assigned by IANA to pcs-pcw (pcs-pcw).

Is port 2566 TCP or UDP?

Port 2566 is registered for TCP and UDP.

Is it safe to open port 2566?

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 2566 is open?

On Linux run "ss -ltnup 'sport = :2566'", on macOS "lsof -nP -i :2566", and on Windows "netstat -ano | findstr :2566" to see the local process. From another machine, "nmap -p 2566 <host>" shows whether it is reachable.

05 Related
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