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// Other services

Port 1892: ChildKey Control

Port 1892 is assigned by IANA to childkey-ctrl (ChildKey Control).

1892

How childkey-ctrl works

Other services
client:1892childkey-ctrlresponse client:1892childkey-ctrlresponse

The client sends a request to port 1892 and the childkey-ctrl 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
Other services
01 Security

Is port 1892 dangerous?

We have no specific security note for port 1892. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1892

ServicePortTransportDescriptionReferenceUpdated
childkey-ctrl 1892 TCP, UDP ChildKey Control - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1892, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1892'      # process listening on 1892
sudo lsof -nP -i :1892

macOS

sudo lsof -nP -i :1892

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1892 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1892
netstat -ano | findstr :1892

From another machine

nmap -p 1892 -sV <host>
sudo nmap -sU -p 1892 <host>
nc -zv <host> 1892

Block it in the firewall

sudo ufw deny 1892/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1892" -Direction Inbound -LocalPort 1892 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1892 used for?

Port 1892 is assigned by IANA to childkey-ctrl (ChildKey Control).

Is port 1892 TCP or UDP?

Port 1892 is registered for TCP and UDP.

Is it safe to open port 1892?

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. Close the port if nothing on the host needs it.

How do I check if port 1892 is open?

On Linux run "ss -ltnup 'sport = :1892'", on macOS "lsof -nP -i :1892", and on Windows "netstat -ano | findstr :1892" to see the local process. From another machine, "nmap -p 1892 <host>" shows whether it is reachable.

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