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// Other services

Port 1820: mcagent

Port 1820 is assigned by IANA to mcagent (mcagent).

1820

How mcagent works

Other services
client:1820mcagentresponse client:1820mcagentresponse

The client sends a request to port 1820 and the mcagent 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 1820 dangerous?

We have no specific security note for port 1820. 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 1820

ServicePortTransportDescriptionReferenceUpdated
mcagent 1820 TCP, UDP mcagent - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1820, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1820'      # process listening on 1820
sudo lsof -nP -i :1820

macOS

sudo lsof -nP -i :1820

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1820 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1820
netstat -ano | findstr :1820

From another machine

nmap -p 1820 -sV <host>
sudo nmap -sU -p 1820 <host>
nc -zv <host> 1820

Block it in the firewall

sudo ufw deny 1820/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1820" -Direction Inbound -LocalPort 1820 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1820 used for?

Port 1820 is assigned by IANA to mcagent (mcagent).

Is port 1820 TCP or UDP?

Port 1820 is registered for TCP and UDP.

Is it safe to open port 1820?

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 1820 is open?

On Linux run "ss -ltnup 'sport = :1820'", on macOS "lsof -nP -i :1820", and on Windows "netstat -ano | findstr :1820" to see the local process. From another machine, "nmap -p 1820 <host>" shows whether it is reachable.

05 Related
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