2. As long as the enterprise is registered, there is a tax registration certificate (notebook or a piece of paper), which has a tax registration number, that is, the enterprise tax number. Then this number is the taxpayer identification number.

3. Then, you can check whether the enterprise is operating normally through this number in the public information. Baidu search "taxpayer information" can be queried if it finds official website.

4. Then enter the website, enter the tax number and verification code, and make an inquiry.

5. The query results can show whether the enterprise is operating normally.