Initially the numbers started with Q, and the oldest existing plate is "Q 53" of a 1903 Wolsley.
Later the island was divided into sections from "A " to "Z" (Ex A 123 ), then after World War II it changed to the two Roman letter plates combining pairs of letters in the word CEYLON .
It is in the form of the country emblem and the two-letter region identifier below the emblem on the left side of the plate, two letters, four digits (serial format AB AB 1234).
As of 2013 a new system was introduced using 3 Latin letters and four digits, starting from “AAA 0001”.
The international vehicle registration code for Sri Lanka is SL.