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// Other services

Port 5820: AutoPass licensing

Port 5820 is assigned by IANA to autopassdaemon (AutoPass licensing).

5820

How autopassdaemon works

Other services
client:5820autopassdaemonresponse client:5820autopassdaemonresponse

The client sends a request to port 5820 and the autopassdaemon service answers.

Transport
TCP
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 5820 dangerous?

We have no specific security note for port 5820. 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 5820

ServicePortTransportDescriptionReferenceUpdated
autopassdaemon 5820 TCP AutoPass licensing - 2024-08-01
-5820-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5820, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5820'      # process listening on 5820
sudo lsof -nP -i :5820

macOS

sudo lsof -nP -i :5820

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5820 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5820
netstat -ano | findstr :5820

From another machine

nmap -p 5820 -sV <host>
nc -zv <host> 5820

Block it in the firewall

sudo ufw deny 5820/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5820" -Direction Inbound -LocalPort 5820 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5820 used for?

Port 5820 is assigned by IANA to autopassdaemon (AutoPass licensing).

Is port 5820 TCP or UDP?

Port 5820 is registered for TCP.

Is it safe to open port 5820?

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 5820 is open?

On Linux run "ss -ltnup 'sport = :5820'", on macOS "lsof -nP -i :5820", and on Windows "netstat -ano | findstr :5820" to see the local process. From another machine, "nmap -p 5820 <host>" shows whether it is reachable.

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