Trademark registration classification inquiries can be made in the following places:

1. Trademark Office official website: The Trademark Office of each country or region will provide trademark registration on its official website Classification query function. You can visit the official website of the trademark office of your country or region and enter the trademark category or keywords in the search bar of the website to query the trademark registration classification.

2. Trademark database website: In addition to the official website of the Trademark Office, some trademark database websites also provide trademark registration classification query functions. These websites collect trademark information from around the world and provide classified search tools that can be queried based on trademark categories, keywords, etc.

3. Trademark agency: Trademark agencies usually provide trademark registration classification query services. You can contact your local trademark agency to ask whether they provide classification search services, and then provide relevant information to let them help you with the search.

In short, trademark registration classification inquiries can be carried out through the official website of the Trademark Office, the trademark database website and trademark agencies.

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