CyberHunter
Local dataset, no network
// Other services

Port 571: udemon

Port 571 is assigned by IANA to meter (udemon).

571

How meter works

Other services
client:571meterresponse client:571meterresponse

The client sends a request to port 571 and the meter 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 571 dangerous?

We have no specific security note for port 571. 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 571

ServicePortTransportDescriptionReferenceUpdated
meter 571 TCP, UDP udemon - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 571, and is it reachable?

Linux

sudo ss -ltnup 'sport = :571'      # process listening on 571
sudo lsof -nP -i :571

macOS

sudo lsof -nP -i :571

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 571 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 571
netstat -ano | findstr :571

From another machine

nmap -p 571 -sV <host>
sudo nmap -sU -p 571 <host>
nc -zv <host> 571

Block it in the firewall

sudo ufw deny 571/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 571" -Direction Inbound -LocalPort 571 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 571 used for?

Port 571 is assigned by IANA to meter (udemon).

Is port 571 TCP or UDP?

Port 571 is registered for TCP and UDP.

Is it safe to open port 571?

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 571 is open?

On Linux run "ss -ltnup 'sport = :571'", on macOS "lsof -nP -i :571", and on Windows "netstat -ano | findstr :571" to see the local process. From another machine, "nmap -p 571 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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