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Port 4684 (rfid-rp1)

IANA assigns port 4684 to rfid-rp1: RFID Reader Protocol 1.0.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rfid-rp1 TCP RFID Reader Protocol 1.0 Michael Mealling 2 -
rfid-rp1 UDP RFID Reader Protocol 1.0 Michael Mealling 2 -

Registry dates for this port: registered 2005-08.

Check what is listening on port 4684

Linux: is anything listening on TCP 4684?
sudo ss -tlnp 'sport = :4684'
Linux: UDP 4684
sudo ss -ulnp 'sport = :4684'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4684
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4684 '
Windows (Command Prompt)
netstat -ano | findstr :4684
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4684 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4684
From Windows
Test-NetConnection HOST -Port 4684
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4684

Block port 4684 in the firewall

ufw
sudo ufw deny 4684/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4684 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4684 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4684' -Direction Inbound -Protocol TCP -LocalPort 4684 -Action Block
ufw
sudo ufw deny 4684/udp
iptables
sudo iptables -A INPUT -p udp --dport 4684 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4684 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4684' -Direction Inbound -Protocol UDP -LocalPort 4684 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.