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Port 4425 (netrockey6)

IANA assigns port 4425 to netrockey6: NetROCKEY6 SMART Plus Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netrockey6 TCP NetROCKEY6 SMART Plus Service Feitian Technologies -
netrockey6 UDP NetROCKEY6 SMART Plus Service Feitian Technologies -

Registry dates for this port: registered 2010-09-15.

Check what is listening on port 4425

Linux: is anything listening on TCP 4425?
sudo ss -tlnp 'sport = :4425'
Linux: UDP 4425
sudo ss -ulnp 'sport = :4425'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4425
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4425 '
Windows (Command Prompt)
netstat -ano | findstr :4425
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4425 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4425
From Windows
Test-NetConnection HOST -Port 4425
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4425

Block port 4425 in the firewall

ufw
sudo ufw deny 4425/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4425 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4425 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4425' -Direction Inbound -Protocol TCP -LocalPort 4425 -Action Block
ufw
sudo ufw deny 4425/udp
iptables
sudo iptables -A INPUT -p udp --dport 4425 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4425 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4425' -Direction Inbound -Protocol UDP -LocalPort 4425 -Action Block

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