Online sales of Class 25 trademarks are **Class 35**.

Online sales are sales through the Internet platform, using multimedia communication and digital technology to achieve marketing goals. Class 35 trademarks are marketing categories, including services provided by individuals or organizations. Their main purposes are:

1. To promote goods and services;

2. Organize commercial and promotional activities to help sellers make sales;

3. Promote sales activities that others have already conducted.

Therefore, online sales of Class 25 trademarks belong to Class 35.