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// Other services

Port 4711: Trinity Trust Network Node Communication

Port 4711 is assigned by IANA to trinity-dist (Trinity Trust Network Node Communication).

4711

How trinity-dist works

Other services
client:4711trinity-distresponse client:4711trinity-distresponse

The client sends a request to port 4711 and the trinity-dist service answers.

Transport
TCP · UDP · SCTP
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 4711 dangerous?

We have no specific security note for port 4711. 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 4711

ServicePortTransportDescriptionReferenceUpdated
trinity-dist 4711 TCP, UDP, SCTP Trinity Trust Network Node Communication - 2017-01-12

// source: IANA service name and port number registry

03 Check it

Which program uses port 4711, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4711'      # process listening on 4711
sudo lsof -nP -i :4711

macOS

sudo lsof -nP -i :4711

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4711 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4711
netstat -ano | findstr :4711

From another machine

nmap -p 4711 -sV <host>
sudo nmap -sU -p 4711 <host>
nc -zv <host> 4711

Block it in the firewall

sudo ufw deny 4711/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4711" -Direction Inbound -LocalPort 4711 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4711 used for?

Port 4711 is assigned by IANA to trinity-dist (Trinity Trust Network Node Communication).

Is port 4711 TCP or UDP?

Port 4711 is registered for TCP and UDP and SCTP.

Is it safe to open port 4711?

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 4711 is open?

On Linux run "ss -ltnup 'sport = :4711'", on macOS "lsof -nP -i :4711", and on Windows "netstat -ano | findstr :4711" to see the local process. From another machine, "nmap -p 4711 <host>" shows whether it is reachable.

05 Related
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