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// Other services

Port 4684: RFID Reader Protocol 1.0

Port 4684 is assigned by IANA to rfid-rp1 (RFID Reader Protocol 1.0).

4684

How rfid-rp1 works

Other services
client:4684rfid-rp1response client:4684rfid-rp1response

The client sends a request to port 4684 and the rfid-rp1 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 4684 dangerous?

We have no specific security note for port 4684. 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 4684

ServicePortTransportDescriptionReferenceUpdated
rfid-rp1 4684 TCP, UDP RFID Reader Protocol 1.0 - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 4684, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4684'      # process listening on 4684
sudo lsof -nP -i :4684

macOS

sudo lsof -nP -i :4684

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4684 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4684
netstat -ano | findstr :4684

From another machine

nmap -p 4684 -sV <host>
sudo nmap -sU -p 4684 <host>
nc -zv <host> 4684

Block it in the firewall

sudo ufw deny 4684/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4684" -Direction Inbound -LocalPort 4684 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4684 used for?

Port 4684 is assigned by IANA to rfid-rp1 (RFID Reader Protocol 1.0).

Is port 4684 TCP or UDP?

Port 4684 is registered for TCP and UDP.

Is it safe to open port 4684?

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 4684 is open?

On Linux run "ss -ltnup 'sport = :4684'", on macOS "lsof -nP -i :4684", and on Windows "netstat -ano | findstr :4684" to see the local process. From another machine, "nmap -p 4684 <host>" shows whether it is reachable.

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