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// Other services

Port 1831: Myrtle

Port 1831 is assigned by IANA to myrtle (Myrtle).

1831

How myrtle works

Other services
client:1831myrtleresponse client:1831myrtleresponse

The client sends a request to port 1831 and the myrtle 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 1831 dangerous?

We have no specific security note for port 1831. 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 1831

ServicePortTransportDescriptionReferenceUpdated
myrtle 1831 TCP, UDP Myrtle - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1831, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1831'      # process listening on 1831
sudo lsof -nP -i :1831

macOS

sudo lsof -nP -i :1831

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1831 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1831
netstat -ano | findstr :1831

From another machine

nmap -p 1831 -sV <host>
sudo nmap -sU -p 1831 <host>
nc -zv <host> 1831

Block it in the firewall

sudo ufw deny 1831/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1831" -Direction Inbound -LocalPort 1831 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1831 used for?

Port 1831 is assigned by IANA to myrtle (Myrtle).

Is port 1831 TCP or UDP?

Port 1831 is registered for TCP and UDP.

Is it safe to open port 1831?

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 1831 is open?

On Linux run "ss -ltnup 'sport = :1831'", on macOS "lsof -nP -i :1831", and on Windows "netstat -ano | findstr :1831" to see the local process. From another machine, "nmap -p 1831 <host>" shows whether it is reachable.

05 Related
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