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Port 30004 (amicon-fpsu-s)

IANA assigns port 30004 to amicon-fpsu-s: Amicon FPSU-IP VPN.

Registered (user) port, 1024-49151 UDP

Port 30004 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
amicon-fpsu-s UDP Amicon FPSU-IP VPN Amicon OOO -

Registry dates for this port: registered 2013-04-25.

Check what is listening on port 30004

Linux: UDP 30004
sudo ss -ulnp 'sport = :30004'
Linux / macOS: which process owns the port
sudo lsof -nP -i :30004
Windows (Command Prompt)
netstat -ano | findstr :30004
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 30004

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 30004

Block port 30004 in the firewall

ufw
sudo ufw deny 30004/udp
iptables
sudo iptables -A INPUT -p udp --dport 30004 -j DROP
nftables
sudo nft add rule inet filter input udp dport 30004 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 30004' -Direction Inbound -Protocol UDP -LocalPort 30004 -Action Block

Related ports

30002pago-services230003amicon-fpsu-ra30100rwp30260kingdomsonline

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.