How do I get a ICAO address for my aircraft?

[NT5224]

As the title says. How do I apply for one? From CASA or Air services? Is there a form? 
 

This is for the purpose of installing my Sky Echo, obviously.

 

Alan

[Thruster88]

From casa. Email [email protected] with your aircraft type, registration mark, serial number. Ask for a hex code.

 

Or if you are VH reg you can see your hex code on flightradar24. Just enter your reg.