Intellectual property rights include several aspects, such as copyright, trademarks, patents and trade secrets. Different places need to apply for and inquire about different contents. Trademarks should be checked by the Trademark Office of the State Administration for Industry and Commerce, and patents should be checked by the website of China National Intellectual Property Administration.
I don't know what you want to find out, or which enterprises have passed the certification of intellectual property standards, or which enterprises have passed which patents and which copyrights. If it is ordinary, it can also be found on platforms such as enterprise inspection.