Same question I asked Gemima, where & how to find my NIK?
NIK = Nomor Induk Kependudukan, is issued by the Catatan Sipil (Civil Registry). After you get KITAS/P you need to register yourself at your local Catatan Sipil in order to get SKTT (if you have KITAS), or KTP (if you have KITAP), along with your Kartu Keluarga. Those documents will contain your NIK.
More on how to obtain SKTT/KTP OA:
SKTT and KTP-OA: Indonesian identification for foreigners - Expat Indo
Indonesian law requires foreign residents to have identity documents (SKTT and KTP-OA) issued by the Civil Registry. We explain how to obtain them.
