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// Other services

Port 579: decbsrv

Port 579 is assigned by IANA to decbsrv (decbsrv).

579

How decbsrv works

Other services
client:579decbsrvresponse client:579decbsrvresponse

The client sends a request to port 579 and the decbsrv 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 579 dangerous?

We have no specific security note for port 579. 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 579

ServicePortTransportDescriptionReferenceUpdated
decbsrv 579 TCP, UDP decbsrv - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 579, and is it reachable?

Linux

sudo ss -ltnup 'sport = :579'      # process listening on 579
sudo lsof -nP -i :579

macOS

sudo lsof -nP -i :579

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 579 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 579
netstat -ano | findstr :579

From another machine

nmap -p 579 -sV <host>
sudo nmap -sU -p 579 <host>
nc -zv <host> 579

Block it in the firewall

sudo ufw deny 579/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 579" -Direction Inbound -LocalPort 579 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 579 used for?

Port 579 is assigned by IANA to decbsrv (decbsrv).

Is port 579 TCP or UDP?

Port 579 is registered for TCP and UDP.

Is it safe to open port 579?

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 579 is open?

On Linux run "ss -ltnup 'sport = :579'", on macOS "lsof -nP -i :579", and on Windows "netstat -ano | findstr :579" to see the local process. From another machine, "nmap -p 579 <host>" shows whether it is reachable.

05 Related
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