Indonesia also used to have car license plate identification codes that meant regions like Korea.
Korea used to be the same. Seoul, Gyeonggi, Gangwon, Busan....
Recently, it has been changed to a nationwide license plate, so there is no regional distinction, and only commercial vehicles are regionally distinguished.
Indonesia still distinguishes regions.
It seems that there are also tax issues and incomplete computerization.

History of Korean car license plates
Recently, due to Uber-type transportation such as GoCar / Grap,
similar to Korea's taxi operating area guarantee, Indonesia also has taxis. If you take a taxi from another region...
If you take a taxi from another region, you may be refused boarding, so it would be good to know this common sense.
Indonesia also has letter codes that distinguish regions like Korea used to.
As you can see from the map above, B is Jakarta, DK is Bali, A is Banten...
Syllabary | Region |
A | Central Java, (except Tangarang) |
AA | Central Java: |
ex Kedu residency: Magelang regency & city, Purworejo, Kebumen, Temanggung, Wonosobo |
AB | Special Region of Yogyakarta |
AD | Central Java: |
|
ex Surakarta residency: |
Surakarta, Sukoharjo, Boyolali, Sragen, Karanganyar, Wonogiri, Klaten |
AE | East Java: |
ex Madiun residency: Madiun Regency & City, Ngawi, Magetan, Ponorogo, Pacitan |
Madiun Regency & City, Ngawi, Magetan, Ponorogo, Pacitan |
AG | East Java: |
ex Kediri residency: Kediri regency & City, Blitar Regency & City, Tulungagung, Nganjuk, Trenggalek |
B | Special Capital Region of Jakarta, Tangerang regency & city, South Tangerang, Depok, Bekasi regency & city |
BA | West Sumatra |
BB | North Sumatra's West Coast |
BD | Aceh |
BE | Lampung |
BG | South Sumatra |
BH | Jambi |
BK | North Sumatra's East Coast |
BL | Aceh |
BM | Riau |
BN | Bangka Belitung Islands |
BP | Riau Islands |
D | West Java: |
|
ex Bandung residency: Bandung regency & City, Cimahi, West Bandung |
DA | South Kalimantan |
DB | North Sulawesi, except Sangihe Islands, Talaud Islands & Sitaro Islands |
DC | West Sulawesi |
DD | South Sulawesi: |
South region: Makassar, Gowa, Maros, Pangkajene Islands, Takalar, Jeneponto, Bulukumba, Bantaeng, Selayar |
DE | Maluku |
DG | North Maluku |
DH | East Nusa Tenggara: Timor |
DK | Bali |
DL | North Sulawesi: |
|
Sangihe Islands, Talaud Islands & Sitaro Islands |
DM | Gorontalo |
DN | Central Sulawesi |
DP | South Sulawesi: |
North region: Barru, Parepare, Pinrang, Sidenreng Rappang, Enrekang, Tana Toraja, North Toraja, Luwu, Palopo, North Luwu, East Luwu |
DR | West Nusa Tenggara: Lombok island |
DS | Papua (became PA in July 2016) |
DT | Southeast Sulawesi |
DW | South Sulawesi: |
Central Region: Bone, Soppeng, Wajo, Sinjai |
E | West Java: |
ex Cirebon residency: Cirebon regency & city, Indramayu, Majalengka, Kuningan |
EA | West Nusa Tenggara: Sumbawa island |
EB | East Nusa Tenggara: Flores island, Alor, Lembata |
ED | East Nusa Tenggara: Sumba island |
F | West Java: |
ex Bogor residency: Bogor regency & city, Cianjur, Sukabumi regency, city |
G | Central Java: |
|
ex Pekalongan residency: Pekalongan regency & city, Tegal Regency & city, Brebes, Batang, Pemalang |
H | Central Java: |
ex Semarang residency: Semarang regency & city, Salatiga, Kendal, Demak |
K | Central Java: |
|
ex Pati residency: Pati, Kudus, Jepara, Rembang, Blora, Grobogan |
KB | West Kalimantan |
KH | Central Kalimantan |
KT | East Kalimantan |
KU | North Kalimantan |
L | East Java: Surabaya |
M | East Java: Madura island |
N | East Java: |
ex Malang residency: Malang regency& city, Probolinggo regency & city, Pasuruan regency & city, Lumajang, Batu |
P | East Java: |
ex Besuki residency: Bondowoso, Situbondo, Jember, Banyuwangi |
PA | Papua[1] |
PB | West Papua |
R | Central Java: |
ex Banyumas residency: Banyumas, Cilacap, Purbalingga, Banjarnegara |
S | East Java: |
ex Bojonegoro residency: Bojonegoro, Mojokerto regency & city, Tuban, Lamongan, Jombang |
T | West Java: |
ex Purwakarta residency: Purwakarta, Karawang, Subang |
W | East Java: Sidoarjo, Gresik |
Z | West Java: |
ex Parahyangan residency: Garut, Tasikmalaya regency & city, Sumedang, Ciamis, Banjar |
Currently, license plates with a white background and black lettering are commonly used.
There are other cases where license plates in use on roads have different colors...
Yellow: Yellow background with black lettering is used for public transportation buses, taxis, etc.
Red: Red background with white lettering is used for government vehicles.
White: White background with blue lettering is used for embassy vehicles.
There are also special license plates.
Vehicle registration and identification, as well as the letters and numbers on license plates, indicate administrative fields. Black license plates with white numbers are used not only for private vehicles but also for government office vehicles.
The letters RFS, RFD, RFL, RFU, RFP engraved on the license plate are vehicles of government or military personnel.
Minister or public office vehicles use red license plates with white numbers, but special vehicles use the RFS letters.
Army - RFD, Navy -RFL, Air Force-RFU, Police - RFP
RFO, RFH, RFQ are license plate numbers for second-grade government offices.
Embassies and diplomats use CD,
Consulates use CC, and the number is designated by country.
Recently, with the implementation of the odd-even traffic system in major cities, license plates indicating special vehicles are exempt from the odd-even system, and it is said that automobile license plates are illegally traded.