The letter NL is the State code allotted by the Central Govt. for registration of Motor Vehicles. The Registration code allotted to each Registering authority by the State Govt. are as follows.
Sl. No. Code Registering Authority
1 NL-01 R.T.O. Kohima
2 NL-02 R.T.O. Mokokchung
3 NL-03 D.T.O. Tuensang
4 NL-04 D.T.O. Mon
5 NL-05 D.T.O. Wokha
6 NL-06 D.T.O. Zunheboto
7 NL-07 D.T.O. Dimapur
8 NL-08 D.T.O. Phek
9 NL-10 RTO Kohima for Govt. non transport  vehicle
10 NL-11 RTO Kohima for Govt. Transport vehicle

The following Registration series are allotted with or without prefix of alphabet to the figures in Arabic by the State Govt.

Sl. No. Code Category
1 NL-01-0000 (without prefix of alphabet) Non transport vehicles
2 NL-01-A-0000 (with prefix of A) Goods vehicle
3 NL-01-B-0000 (with prefix of B) Passengers vehicle, Bus
4 NL-01-C-0000 (with prefix of C) Non transport vehicle
5 NL-01-D-0000 (with prefix of D) Goods vehicle
6 NL-01-E-0000 (with prefix of E) Two Wheeler
7 NL-01-F-0000 (with prefix of F) Three wheeler auto taxi
8 NL-01-T-0000 (with prefix of T) Taxi