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// Other services

Port 21212: Distributed artificial intelligence

Port 21212 is assigned by IANA to trinket-agent (Distributed artificial intelligence).

21212

How trinket-agent works

Other services
client:21212trinket-agentresponse client:21212trinket-agentresponse

The client sends a request to port 21212 and the trinket-agent 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 21212 dangerous?

We have no specific security note for port 21212. 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 21212

ServicePortTransportDescriptionReferenceUpdated
trinket-agent 21212 TCP Distributed artificial intelligence - 2017-11-29
-21212-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 21212, and is it reachable?

Linux

sudo ss -ltnup 'sport = :21212'      # process listening on 21212
sudo lsof -nP -i :21212

macOS

sudo lsof -nP -i :21212

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 21212 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 21212
netstat -ano | findstr :21212

From another machine

nmap -p 21212 -sV <host>
nc -zv <host> 21212

Block it in the firewall

sudo ufw deny 21212/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 21212" -Direction Inbound -LocalPort 21212 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 21212 used for?

Port 21212 is assigned by IANA to trinket-agent (Distributed artificial intelligence).

Is port 21212 TCP or UDP?

Port 21212 is registered for TCP.

Is it safe to open port 21212?

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 21212 is open?

On Linux run "ss -ltnup 'sport = :21212'", on macOS "lsof -nP -i :21212", and on Windows "netstat -ano | findstr :21212" to see the local process. From another machine, "nmap -p 21212 <host>" shows whether it is reachable.

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