Resident Registration Number - Components

Components

The resident registration number consists of 13 digits, with each block serving a certain function, as illustrated below:

yymmdd-sbbbbnc

The first six digits signify the person's date of birth. For example, a person born on September 1, 1946, such as former President Roh Moo-Hyun, would have 460901 for the first six digits.

s, the seventh digit, indicates the sex and the century in which the person was born. The code used for each category follows:

• 1: male Korean citizens (born 1900 - 1999)
• 2: female Korean citizens (born 1900 - 1999)
• 3: male Korean citizens (born 2000 - 2099)
• 4: female Korean citizens (born 2000 - 2099)
• 5: male foreign citizens residing in Korea (born 1900 - 1999)
• 6: female foreign citizens residing in Korea (born 1900 - 1999)
• 7: male foreign citizens residing in Korea (born 2000 - 2099)
• 8: female foreign citizens residing in Korea (born 2000 - 2099)

bbbb, the eighth through eleventh digit, signify a code for the person's place of birth:

n, the 12th digit, is a sequential number used to differentiate those of the same sex born on the same day in the same location.

c, the 13th digit, is a check digit, used to verify that the number has been transcribed correctly. It is generated from the rest of the digits using the following algorithm (digits lettered a through m in order):

m = mod 10