Can a Sri Lankan number plate tell you the exact registration year?

Not exactly. The Department of Motor Traffic does not publish an official prefix-to-year table, and personalised numbers can break the sequence. The letter series only narrows the year to a likely range. For the exact date, check the vehicle's registration book (CR) or the DMT's online registered-vehicle service.

What do the three letters on a Sri Lankan car plate mean?

On the current format (e.g. CAB-1234), the first letter is the vehicle class — C is a car, B a motorcycle, A a three-wheeler, D a dual-purpose van. The next two letters are a running serial block that advances over time (CAA → CAB → … → CBA), which is what lets you estimate the registration year.

When did the CAA / CAB / CBA car series start?

The three-letter system launched with CAA-0001 on 13 July 2013. CAB was being issued by late 2014. The CA block (CAA–CAZ) was largely used up by around 2018, when registrations moved into CBA. So a CAB plate is roughly a 2014–2015 car and CBA roughly 2018.

Why is the estimate less reliable for newer plates?

Sri Lanka froze most vehicle imports from 2020 to 2022, so new car registrations slowed to a trickle and the letter series barely advanced for three years. That makes any year estimate beyond the CBA (2018) series approximate. The tool flags these as low confidence and points you to the DMT record.

What do the WP, CP, SP letters before the numbers mean?

Those are province codes used on plates issued between 2000 and 2022: WP Western, CP Central, SP Southern, NP Northern, EP Eastern, NW North Western, NC North Central, UP Uva, and SG Sabaragamuwa. They mark where the vehicle was first registered. From 1 January 2023 new registrations and ownership transfers drop the province code.

How do I read an older two-letter plate like WP GA-5678?

Between 2000 and 2013 plates used a two-letter serial group. For Western-Province cars that group ran roughly G in 2001–2002, H in 2003–2004, J in 2004–2005, and K from 2005 onward. The leading letter still encodes class. These ranges are coarse because other provinces moved at their own pace.

What about the old numeric and “Sri” plates?

Purely numeric plates pre-date the 2000 province-letter system; the “65-xxxx” block was the last numeric series, issued around 2000. Plates with the Sinhala “ශ්රී” marker date from 1956 to 2000. For these vintage vehicles only the era can be given — the registration book holds the actual date.

Does this work for motorcycles, three-wheelers, and lorries?

It identifies the class for all of them (B motorcycle, A three-wheeler, D dual-purpose, L lorry/bus, R tractor) and tells you the format era. A precise year estimate is only given for cars, because each class has its own serial that advances at a different speed and only the car series has firmly dated public anchors.

Sri Lanka · Vehicles

Sri Lanka Number Plate Year Checker

Estimate a vehicle's registration year, province, and class straight from its number plate. Reads the current CAB-1234 series, older WP GA-5678 province plates, and the vintage numeric series — with the year shown as an honest range, sources cited.

Requested by Kalindu

By Induwara Ashinsana— Executive Director, Ryzera TechnologiesUpdated Jun 3, 2026

Number plate year checkerSri Lanka

Enter a number plate

Works with current plates (CAB-1234), older province plates (WP GA-5678) and the “65-” numeric series. Province prefix optional.

Try an example

Estimated year

≈ 2014–2015

Vehicle class

Motor car

Province

Not on plate

Confidence

High confidence

How we read this plate

Format / era: Three-letter format (2013–present)
Letter group: CAB
Serial number: 1234
Class note: Cars use the triple-letter “C” series (CAA, CAB … CBA …).

Interpolated from the dated CAA (Jul 2013), CAB (2014) and CBA (2018) car-series anchors.

Cross-check (straight-line CAA→CBA model): ≈ 2014. Closeness to the main estimate is a measure of how reliable the year is.

Confirm the exact date at the DMT eService

The year is an estimate from documented series-launch dates — not an official lookup. For the exact registration date, check the vehicle’s registration book (CR) or the DMT eService. Sources cited last verified 2026-06-03.

How it works

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.

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.

Worked examples

Plate

CAB-1234≈ 2014–2015 · Motor car · High confidence

Format: three letters + four digits → 2013-onward series.
Class: leading letter C → motor car.
Serial index: (A−A)×26 + (B−A) = 1.
Interpolate between CAA (idx 0, mid-2013) and CAB (idx 1, late 2014) → ≈ 2014.8.
Rounded band: ≈ 2014–2015.

Plate

CBA-0001≈ 2018 · Motor car · High confidence

Serial index: (B−A)×26 + (A−A) = 26.
Index 26 lands exactly on the dated CBA anchor (2018) — the CA→CB transition.
Straight-line CAA→CBA cross-check also returns 2018: the estimate is solid.
Result: a CBA car was first registered around 2018.

Plate

WP GA-5678≈ 2001–2002 · Motor car · Western Province

Province code WP → Western Province (pre-2023 issue).
Two-letter group → the 2000–2013 format.
Western-Province car serials beginning G were issued ≈ 2001–2002.
Range is coarse: other provinces advanced through the letters at their own pace.

Frequently asked questions

Sources & references

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.

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Comments & feedback

Spotted a bug or want an improvement? Tell us — our team reviews every comment, and good ideas get built. Comments are public and anonymous.

Spotted a plate the estimate gets wrong, or know a firmer series-launch date?

Email me at [email protected] — most fixes ship within 24 hours.