AUSTRALIAAustralia Federal Interstate License Plates
First Letter: State
  A = ACT
  C = Northern Territory
  N = New South Wales
  Q = Queensland
  S = South Australia
  T = Tasmania
  V = Victoria
  W = Western Australia
Second Letter: Type
  V = Vehicle (Truck)
  T = Trailer
  X = Heavy Vehicle

Last Letter:
  M = Vehicle with mileage monitoring device

AA-000 = unknown - perhaps older format
Even though Australia is not able to participate in the North American IRP, it does issue interstate plates.
These are captioned "FEDERAL INTERSTATE" and are for trucks, trailers and heavy vehicles travelling across Australia.

Pictures from Ian Field, Gary Walker, Michael Lackey, and my collection.

SAMPLE



AUSTRALIAN CAPITAL TERRITORY



NORTHERN TERRITORY



NEW SOUTH WALES



QUEENSLAND



SOUTH AUSTRALIA



TASMANIA



VICTORIA



WESTERN AUSTRALIA