Sri Lanka Number Plate Year Checker, and the Ongoing Vehicle Registration Number

A Sri Lankan number plate carries three readable signals: the province (the two-letter code such as WP or SP, used on plates issued 2000–2022), the vehicle class (the leading letter of the alphabetic group), and a running serial that advances as more vehicles are registered. The first two are deterministic and come straight from the Department of Motor Traffic (DMT) and the published class-letter convention. The registration year is an estimate derived from the serial. For the province codes and class letters on their own, what each part of a plate means, without the year estimate, see Sri Lanka number plate format & province codes.

The current format, introduced on 13 July 2013, is three Latin letters plus four digits (CAA-0001 onward). For cars the leading letter is C, and the remaining two letters form a base-26 serial block: CAA, CAB, … CAZ, then CBA. We convert a car's two trailing letters to an index, idx = (L2−A)×26 + (L3−A), so CAA is 0, CAB is 1, and CBA is 26.

That index is then mapped to a calendar year by piecewise-linear interpolation between firmly dated anchor points: CAA at mid-2013 (the launch), CAB in late 2014 (documented in contemporary registration records), and CBA in 2018 (when the CA block was exhausted). An independent straight-line model using only the CAA and CBA endpoints is computed alongside as a cross-check; when the two agree closely, the year is reliable, and the tool reports a confidence level rather than a single false-precise number.

Two honest limits are built in. First, Sri Lanka suspended most vehicle imports from 2020 to 2022, so the series barely moved for three years, any estimate past the CBA (2018) anchor is flagged low confidence. Second, owners can buy personalised numbers out of sequence, and each non-car class (motorcycles on the B-series, three-wheelers on A, dual-purpose on D) advances at its own rate, so the tool gives those only the format era. Whenever precision matters, it links to the DMT's online registered-vehicle service, which returns the actual registration date.

It is the point the Department of Motor Traffic's running sequence has reached. DMT's own wording for the enquiry is the last issued vehicle numberof a given vehicle category, so when people search for the “ongoing number”, or the RMV ongoing number(the department grew out of the Registrar of Motor Vehicles office, and the older abbreviation stuck), they are asking the same thing: which plate is being issued right now. Vehicles are registered on every working day, so that number keeps moving. No static page. This one included, can hold today's exact value, which is why none is quoted here.

1. How to read today's exact value

DMT runs this as a standalone online enquiry, listed on its own site as Enquire Ongoing Registration Number and served at eservices.motortraffic.gov.lk/OngoingNo. Pick the vehicle category from the dropdown, press Find, and the service returns the last issued registration number for that category. It asks nothing about you or your vehicle, only which category you want, so the answer you get is the department's own, not an estimate. These steps were checked on 1 October 2026; if the screens differ when you open them, trust the service and confirm current requirements with DMT, not this page.

2. Why the letter block tells you roughly where the series is

Even without opening the eService, the three-letter block brackets the answer for cars, because the car series advances in one direction only: CAA went into issue at the launch in mid-2013, CAB was current by late 2014, the CA block was exhausted into CBA around 2018, and CCAsits at roughly 2024. Those first three are the dated anchors this page's estimate is built on. The CCA figure is our own soft estimate, not a DMT publication. It exists to keep extrapolation bounded through the 2020–2022 import freeze, and the tool flags anything past CBA as low confidence. Each class runs its own sequence (motorcycles on B, three-wheelers on A, dual-purpose on D), which is exactly why the eService asks you to choose a category.

3. “Ongoing” is not the same as your vehicle's registration year

These are two different questions and it is worth keeping them apart. The ongoing number is DMT-wide and about now: the plate the department is issuing today, the same answer for everybody who asks. Your vehicle's registration yearis about one plate in the past, and that is what the checker at the top of this page estimates. It reads the letters on a plate you already have and works backwards to the year it was likely registered. The ongoing number cannot tell you a specific vehicle's year, and a plate's year cannot tell you the ongoing number. For a precise registration date, the registration book (CR) or DMT's registered-vehicle service is the authority either way.

• Department of Motor Traffic (DMT): official site
• DMT: Ongoing / Registered Vehicle Number online service
• Vehicle registration plates of Sri Lanka: system history (Wikipedia)
• MotorGuide.lk: vehicle class from the number plate letters

Plate format, province codes, and class letters are taken from the DMT and the MotorGuide class guide. Year anchors come from the dated DMT “CAA” launch (13 July 2013) and contemporary community registration records. Last cross-checked on 2026-06-03. The year is always an estimate, confirm exact dates against the registration book (CR) or the DMT service above.