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// Network services

Port 4566: Kids Watch Time Control Service

Port 4566 is assigned by IANA to kwtc (Kids Watch Time Control Service).

4566

How kwtc works

Network services
client:4566kwtcresponse client:4566kwtcresponse

The client sends a request to port 4566 and the kwtc 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
Network services
01 Security

Is port 4566 dangerous?

We have no specific security note for port 4566. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 4566

ServicePortTransportDescriptionReferenceUpdated
kwtc 4566 TCP, UDP Kids Watch Time Control Service - 2006-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 4566, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4566'      # process listening on 4566
sudo lsof -nP -i :4566

macOS

sudo lsof -nP -i :4566

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4566 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4566
netstat -ano | findstr :4566

From another machine

nmap -p 4566 -sV <host>
sudo nmap -sU -p 4566 <host>
nc -zv <host> 4566

Block it in the firewall

sudo ufw deny 4566/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4566" -Direction Inbound -LocalPort 4566 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4566 used for?

Port 4566 is assigned by IANA to kwtc (Kids Watch Time Control Service).

Is port 4566 TCP or UDP?

Port 4566 is registered for TCP and UDP.

Is it safe to open port 4566?

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. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 4566 is open?

On Linux run "ss -ltnup 'sport = :4566'", on macOS "lsof -nP -i :4566", and on Windows "netstat -ano | findstr :4566" to see the local process. From another machine, "nmap -p 4566 <host>" shows whether it is reachable.

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