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// Other services

Port 2584: cyaserv

Port 2584 is assigned by IANA to cyaserv (cyaserv).

2584

How cyaserv works

Other services
client:2584cyaservresponse client:2584cyaservresponse

The client sends a request to port 2584 and the cyaserv 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 2584 dangerous?

We have no specific security note for port 2584. 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 2584

ServicePortTransportDescriptionReferenceUpdated
cyaserv 2584 TCP, UDP cyaserv - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2584, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2584'      # process listening on 2584
sudo lsof -nP -i :2584

macOS

sudo lsof -nP -i :2584

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2584 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2584
netstat -ano | findstr :2584

From another machine

nmap -p 2584 -sV <host>
sudo nmap -sU -p 2584 <host>
nc -zv <host> 2584

Block it in the firewall

sudo ufw deny 2584/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2584" -Direction Inbound -LocalPort 2584 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2584 used for?

Port 2584 is assigned by IANA to cyaserv (cyaserv).

Is port 2584 TCP or UDP?

Port 2584 is registered for TCP and UDP.

Is it safe to open port 2584?

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 2584 is open?

On Linux run "ss -ltnup 'sport = :2584'", on macOS "lsof -nP -i :2584", and on Windows "netstat -ano | findstr :2584" to see the local process. From another machine, "nmap -p 2584 <host>" shows whether it is reachable.

05 Related
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