1. Check the trademark information through the website of the Trademark Registration Bureau. When inquiring about trademark information, you can get the name, address, telephone number, email address and other information of the trademark registrant.

2. Inquire through the trademark information inquiry platform. These platforms usually contain a lot of trademark information, including the contact information of trademark registrants. It can be searched by Baidu or other search engines, such as China Trademark Network and National Trademark Announcement Query Network.

3. Contact a trademark lawyer for consultation. Trademark lawyers are very familiar with the information of trademark registrants and can help you contact trademark registrants.

4. If you have a trademark number or name, you can log on to the National Intellectual Property Service Network, enter the China Trademark Network of the State Intellectual Property Trademark Office through "China Trademark Query", and select "Trademark Comprehensive Query" to enter the name of the trademark or the name of the applicant to query. The query results will show the comprehensive information of the trademark, including the name and address of the trademark registrant or applicant.

it should be noted that the inquired contact information should be public, and attention should be paid to legality and compliance in the process of obtaining contact information, respecting the privacy and information security of others. At the same time, you should be polite and respectful when contacting the trademark owner to avoid causing disputes or offending the other party.