To check international trademark registration, you can follow the following steps:

1. Visit the International Trademark Office website: International trademark registration is usually managed by the World Intellectual Property Organization (WIPO). Visit WIPO's official website

2. Choose the Madrid system: International trademark registration is usually carried out through the Madrid system. On the WIPO website, find the Madrid system or select the "Trademarks" section.

3. Enter Madrid-Services: In the Madrid system, select Madrid-Services or a similar option to enter the online service platform.

4. Conduct a trademark query: In the Madrid-Services platform, select "Search" or "GlobalBrandDatabase" (global brand database), and then enter relevant trademark information, such as trademark name, registrant wait.

5. Browse the query results: The query results page will display the international trademark registration information related to the input information, including the trademark status, registration number, applicant, etc.

6. Detailed trademark information: Click on a specific trademark entry to view more detailed trademark information, such as trademark pattern, registration date, country/region coverage, etc.

Please note that the Madrid system covers multiple countries and regions, so the query results may include trademark registration information in multiple countries.

The above steps are for reference only. The specific query process may change due to the update of the WIPO website. If you encounter problems, it is recommended to consult the relevant guides on the WIPO website or contact WIPO's customer service department for assistance.

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