Taiwan UBN check

Q: Can I check UBNs from code or in bulk?

Yes. The same check is available over the REST API (GET /v1/tw/ubn/{id}) and the MCP server, with the same key as every other country. See the API docs.

Check a Taiwan UBN against the official registry and get the legal name, the status and a pass, review or fail verdict. Official registry

Example: 22099131 (TSMC). No account needed: 10 lookups a day per network, shared with the keyless API.

What this check tells you

Official registry

For UBN we first check the structure and check digit, then look the number up in Taiwan Ministry of Economic Affairs, GCIS company registration open data (live). The answer gives the legal name and the registry status, and a pass, review or fail verdict with reasons. Every answer carries source.data_as_of.

Businesses run by one person get their status only, never a name or address.

Taiwan ID formats we check

ID type	Level	Check digit	API endpoint	Official lookup
UBN Unified Business Number (統一編號)	Official registry	Ministry of Finance weighted sum divisible by 5 (2023 rule)	`GET /v1/tw/ubn/{id}`	GCIS company and business registration search

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/tw/ubn/22099131" \
  -H "Authorization: Bearer $KEY"

Get a no-cost API key (100 lookups a day) or read the API docs.

Questions

Does a valid UBN mean the company exists?

Only the registry lookup tells you that. A number that passes the format check is then looked up in Taiwan Ministry of Economic Affairs, GCIS company registration open data; the answer says whether it was found and its status.

Where does the data come from?

From Taiwan Ministry of Economic Affairs, GCIS company registration open data (live). Each answer includes the source and the date of the data.

Can I check UBNs from code or in bulk?

Yes. The same check is available over the REST API (GET /v1/tw/ubn/{id}) and the MCP server, with the same key as every other country. See the API docs.

Is this service affiliated with the Taiwan 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 Taiwan authority.