HTTPfy

Port 4566 (kwtc)

IANA assigns port 4566 to kwtc: Kids Watch Time Control Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
kwtc TCP Kids Watch Time Control Service Larry Zarou -
kwtc UDP Kids Watch Time Control Service Larry Zarou -

Registry dates for this port: registered 2006-10.

Check what is listening on port 4566

Linux: is anything listening on TCP 4566?
sudo ss -tlnp 'sport = :4566'
Linux: UDP 4566
sudo ss -ulnp 'sport = :4566'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4566
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4566 '
Windows (Command Prompt)
netstat -ano | findstr :4566
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4566 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4566
From Windows
Test-NetConnection HOST -Port 4566
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4566

Block port 4566 in the firewall

ufw
sudo ufw deny 4566/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4566 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4566 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4566' -Direction Inbound -Protocol TCP -LocalPort 4566 -Action Block
ufw
sudo ufw deny 4566/udp
iptables
sudo iptables -A INPUT -p udp --dport 4566 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4566 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4566' -Direction Inbound -Protocol UDP -LocalPort 4566 -Action Block

Related ports

4559hylafax4563amahi-anywhere4567tram4568bmc-reporting

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