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// Other services

Port 6581: Parsec Peer-to-Peer

Port 6581 is assigned by IANA to parsec-peer (Parsec Peer-to-Peer).

6581

How parsec-peer works

Other services
client:6581parsec-peerresponse client:6581parsec-peerresponse

The client sends a request to port 6581 and the parsec-peer 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 6581 dangerous?

We have no specific security note for port 6581. 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 6581

ServicePortTransportDescriptionReferenceUpdated
parsec-peer 6581 TCP, UDP Parsec Peer-to-Peer - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6581, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6581'      # process listening on 6581
sudo lsof -nP -i :6581

macOS

sudo lsof -nP -i :6581

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6581 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6581
netstat -ano | findstr :6581

From another machine

nmap -p 6581 -sV <host>
sudo nmap -sU -p 6581 <host>
nc -zv <host> 6581

Block it in the firewall

sudo ufw deny 6581/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6581" -Direction Inbound -LocalPort 6581 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6581 used for?

Port 6581 is assigned by IANA to parsec-peer (Parsec Peer-to-Peer).

Is port 6581 TCP or UDP?

Port 6581 is registered for TCP and UDP.

Is it safe to open port 6581?

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 6581 is open?

On Linux run "ss -ltnup 'sport = :6581'", on macOS "lsof -nP -i :6581", and on Windows "netstat -ano | findstr :6581" to see the local process. From another machine, "nmap -p 6581 <host>" shows whether it is reachable.

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