0   Foreign worker
1   Thai nationals who was born after 1 January 1984 and had their birth notified within given deadline (15 days).
2   Thai nationals who was born after 1 January 1984 but failed to had their birth notified in time.
3   Thai nationals who was born before 1 January 1984 and had not yet moved their residence.
4   Thai nationals who was born and moved their residence before 1 January 1984.
5   Dual Nationality which born outside Kingdom, or People who missed the official census.
6   Minority or Foreign nationals who are living in Thailand temporarily and illegal migrants.
7   Children of people of category 6
8   1. Foreign nationals who are living in Thailand permanently.
    2. Thai nationals by naturalization (Sub-sequence from above).