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// Other services

Port 4104: Braille protocol

Port 4104 is assigned by IANA to brlp-3 (Braille protocol).

4104

How brlp-3 works

Other services
client:4104brlp-3response client:4104brlp-3response

The client sends a request to port 4104 and the brlp-3 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 4104 dangerous?

We have no specific security note for port 4104. 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 4104

ServicePortTransportDescriptionReferenceUpdated
brlp-3 4104 TCP, UDP Braille protocol - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 4104, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4104'      # process listening on 4104
sudo lsof -nP -i :4104

macOS

sudo lsof -nP -i :4104

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4104 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4104
netstat -ano | findstr :4104

From another machine

nmap -p 4104 -sV <host>
sudo nmap -sU -p 4104 <host>
nc -zv <host> 4104

Block it in the firewall

sudo ufw deny 4104/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4104" -Direction Inbound -LocalPort 4104 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4104 used for?

Port 4104 is assigned by IANA to brlp-3 (Braille protocol).

Is port 4104 TCP or UDP?

Port 4104 is registered for TCP and UDP.

Is it safe to open port 4104?

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 4104 is open?

On Linux run "ss -ltnup 'sport = :4104'", on macOS "lsof -nP -i :4104", and on Windows "netstat -ano | findstr :4104" to see the local process. From another machine, "nmap -p 4104 <host>" shows whether it is reachable.

05 Related
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