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// Other services

Port 584: Key Server

Port 584 is assigned by IANA to keyserver (Key Server).

584

How keyserver works

Other services
client:584keyserverresponse client:584keyserverresponse

The client sends a request to port 584 and the keyserver 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 584 dangerous?

We have no specific security note for port 584. 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 584

ServicePortTransportDescriptionReferenceUpdated
keyserver 584 TCP, UDP Key Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 584, and is it reachable?

Linux

sudo ss -ltnup 'sport = :584'      # process listening on 584
sudo lsof -nP -i :584

macOS

sudo lsof -nP -i :584

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 584 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 584
netstat -ano | findstr :584

From another machine

nmap -p 584 -sV <host>
sudo nmap -sU -p 584 <host>
nc -zv <host> 584

Block it in the firewall

sudo ufw deny 584/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 584" -Direction Inbound -LocalPort 584 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 584 used for?

Port 584 is assigned by IANA to keyserver (Key Server).

Is port 584 TCP or UDP?

Port 584 is registered for TCP and UDP.

Is it safe to open port 584?

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 584 is open?

On Linux run "ss -ltnup 'sport = :584'", on macOS "lsof -nP -i :584", and on Windows "netstat -ano | findstr :584" to see the local process. From another machine, "nmap -p 584 <host>" shows whether it is reachable.

05 Related
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