Under ICP, all websites with their own domain name that operate inside China must obtain a license, whether hosted on a server in mainland China or provided to visitors from China via a CDN. Licenses are issued at the provincial level. You can use the Ministry of Industry and Information Technology (MIIT) website to check if a domain already has an ICP number (only available in Chinese).
All public websites in mainland China must have an ICP number displayed on the website’s home page. Websites with the same apex domain can share the same ICP number. China-based hosting providers are instructed to shut down any website (often without notice) without an ICP number.
