Validate any 18-digit Unified Social Credit Code in seconds — checksum (GB 32100), registration region and entity type. 100% in your browser, no data stored.
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GB 32100 Checksum
Verifies the MOD 31-3 check digit of the 18-digit USCC
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Entity Type Decode
Reads enterprise / individual / cooperative / organ from the leading digits
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Region Decode
Maps the registration authority administrative code to a province
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Zero Cost & Private
Pure front-end algorithm — no API, no database, nothing leaves your browser
Validate a Code
Enter an 18-digit Unified Social Credit Code. Validation runs instantly in your browser.
How the 18 Digits Are Structured
The Unified Social Credit Code (GB 32100-2015) packs four segments into 18 characters:
3–83-8Administrative division code of the registering authority (GB/T 2260, province + city + district).
9–179-17Subject identifier (organization code) assigned by the registry.
1818Check digit computed by the GB 32100 MOD 31-3 algorithm from the first 17 digits.
The USCC contains no establishment date. Foreign vs. domestic ownership is also not encoded — both use the "91" enterprise prefix.
What is the Unified Social Credit Code?
The Unified Social Credit Code (统一社会信用代码, USCC) is the 18-character identifier assigned to every legal person and organization registered in China under GB 32100-2015. It replaced the former business license number, organization code and tax registration number with a single code used across government and commercial systems. Almost every Chinese company, NGO, public institution and farmers’ cooperative holds one.
The code is not random: the first two digits encode the registration authority and entity category, digits 3-8 encode the administrative region of the registering authority, digits 9-17 are the registry-assigned subject identifier, and the 18th digit is a checksum computed with the GB 32100 MOD 31-3 algorithm. This validator applies that exact algorithm locally in your browser, so you can instantly tell whether a code is well-formed before deciding to query official records.
The USCC is the 18-character unified identifier assigned to every legal person and organization registered in China (GB 32100-2015), replacing the former business license number and organization code. It is required for most business activities in China.
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What does this validator actually check?
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It checks the check digit (position 18) against the GB 32100 MOD 31-3 algorithm and decodes the registration region (positions 3-8) and entity type (positions 1-2). It is a pure front-end check — no database is queried and nothing is transmitted.
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Does a valid checksum mean the company exists?
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No. A well-formed code only proves internal consistency. Always confirm real registration and current status with the SAMR registry — use the search button above.
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Can I tell if a company is foreign-owned (WFOE / joint venture) from the code?
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No. Both domestic and foreign-invested enterprises use the "91" prefix, so ownership cannot be read from the code itself and must be confirmed from registration records.
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Can the USCC reveal the year of establishment?
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No. The 18 digits do not include any date. The establishment date appears only in the official registration record.
Validation is based on the GB 32100 checksum algorithm and is for reference only.
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