South Korea RRN Validator
South Korea RRN Validator
Verify the structure of a Korean Resident Registration Number.
About the South Korea RRN Validator
The South Korea RRN (Resident Registration Number) Validator is designed to verify the 13-digit identification number issued to all residents of South Korea. The RRN encodes the person's date of birth, gender, and registration location, followed by a modulo checksum digit. Our tool mathematically validates the RRN to ensure it is structurally authentic without storing any sensitive data. It's an excellent utility for developers and HR teams needing to implement basic data sanitization and validation for Korean users or employees.
Frequently Asked Questions
What information is in the RRN?
The first 6 digits represent the date of birth (YYMMDD). The 7th digit indicates gender and century (e.g., 1 for 1900s Male, 2 for 1900s Female, 3 for 2000s Male). The remaining digits contain location codes, a sequence, and a final check digit.
How is the checksum calculated?
Each of the first 12 digits is multiplied by a specific weight (2 through 9, then 2 through 5). The sum is divided by 11, subtracted from 11, and the final digit is taken. (Note: Since 2020, South Korea has moved to randomize the back digits for new issues, but historical validation still applies to older numbers).
Is my data safe?
Yes, the validation runs entirely on your device using local JavaScript. Your RRN is never saved, cached, or transmitted to any server.
How to use the South Korea RRN Validator tool
Using our South Korea RRN Validator is incredibly easy and entirely free. We designed our Developer Tools specifically for everyday users who need to get things done quickly without downloading complicated software or registering for an account.
- Enter RRN: Input a 13-digit Korean ID.
- Extract: Extract the birthdate and gender logic.
100% Secure
Your files are encrypted and automatically deleted from our servers after 1 hour. Your privacy is guaranteed.
Lightning Fast
We use high-performance cloud processing to ensure your files are ready in seconds, not minutes.
Works on Mobile
No app installation needed. Use our tools seamlessly on iOS, Android, Mac, or Windows.