No vehicles are registered by the Dominion authorities, all Diplomatic Corps plates are registered in Ontario.

1959-1973 series white on red, diplomatic plates used a CD prefix, and Consular Corps plates used a CC prefix.
Serial letter added in 1973.

1986-current 020♔CDA to 979♔CDZ series Diplomatic Corps

1985-2007 series Consular Corps personnel had a CONSUL prefix, but without the flag in the centre, which exceptionally was placed in the lower left corner.

1946-72 Consular Corps plates used a CC prefix with normal passenger colours (blue on white) until  1972 when white on red was adopted.