South Korea BRN check
Check that a South Korea BRN is well formed and its check digit is right, before you pay or onboard a supplier. Format only
Example: 124-81-00998 (Samsung Electronics). No account needed: 10 lookups a day per network, shared with the keyless API.
What this check tells you
Format only
We check the structure and the check digit published by the issuing authority, offline. That catches typos and made-up numbers. It does not show that the business exists, is registered or is active, so a well-formed number gets review, never pass.
South Korea ID formats we check
| ID type | Level | Check digit | API endpoint | Official lookup |
|---|---|---|---|---|
| BRN Business Registration Number (사업자등록번호) | Format only | National Tax Service weighted mod 10 | GET /v1/kr/brn/{id} | None |
From code
Same key and quota as every other country. A well-formed request costs one lookup; a source that does not answer returns HTTP 503 and is not counted.
curl "https://taxid.halpii.com/v1/kr/brn/124-81-00998" \
-H "Authorization: Bearer $KEY"Get a no-cost API key (100 lookups a day) or read the API docs.
Questions
Does a valid BRN mean the company exists?
No. This is a format check: it confirms the structure and check digit, not that the business exists or is active. Ask the supplier for its registration certificate.
Where does the data come from?
No registry is queried. The rules come from the issuing authority's published format and check-digit algorithm (National Tax Service weighted mod 10).
Can I check BRNs from code or in bulk?
Yes. The same check is available over the REST API (GET /v1/kr/brn/{id}) and the MCP server, with the same key as every other country. See the API docs.
Is this service affiliated with the South Korea tax authority?
No. HALPII Tax ID is an independent service run by HALPII S.A.C. (Lima, Peru). Results are informational, not legal or tax advice.
Other countries in Asia-Pacific
All countries and verification levels
Last updated 2026-11-14. An independent service run by HALPII S.A.C. (Lima, Peru), not affiliated with or endorsed by any South Korea authority.