> For the complete documentation index, see [llms.txt](https://docs.cnpj.ws/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cnpj.ws/en/blog/o-que-e-cnpj.md). # What is CNPJ The National Register of Legal Entities is the registration used by the Federal Revenue to open an institution with or without profit purposes, in order to monitor the financial movements of these organizations. Through the CNPJ, the company exists before the government and its operation in the market is legalized. The CNPJ is composed of 14 numbers, with the first 8 being the company's registration, the next 4 demonstrating whether the institution is a headquarters or a branch. The number known as "mil contra", 0001, is used for headquarters, and the following numbers, 0002, 0003, and others, are used for branches. The last 2 numbers are the check digits. The standard for registration is: XX.XXX.XXX/000X-XX. The functions of the document vary, and it can be used to prove the existence of the organization, issue invoices, hire suppliers or employees, take out loans, or make financing. For these reasons, it is not only companies that need the CNPJ; other institutions also benefit from this registration, such as churches, associations, NGOs, political parties, and others. The information found in the National Register of Legal Entities includes the CNPJ number, the organization's opening date, the institution's name and trade name, the economic activities in which the company operates, address, and phone number. To obtain this registration, you need to submit an online application on the Federal Revenue website and fill out the registration form with the necessary documents. To find a company's CNPJ, simply access the CNPJws website, an API developed to consult legal entity data. The platform offers 5 plans: Free, Basic, Intermediate, Advanced, and Premium. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.cnpj.ws/en/blog/o-que-e-cnpj.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.