Internet identifier is the key resource for identifying and managing goods, information and machines in the Internet. It is an important basis for the operation and development of the Internet. In the process of correspondingly identifying personal information and basic resources, there are also major security risks of personal information leakage. At present, the introduction of privacy protection laws such as the GDPR and the Cyber Security Law of the People’s Republic of China imposes stricter requirements on the protection of personal information. This study first analyzes the privacy risk of the Internet identifier and discusses the challenges of personal privacy protection; then uses the typical Internet identifier-domain name as an example to deeply analyze the privacy risk in the Internet identifier service process. Combining the different privacy protection needs of the data life cycle, the Internet identifier privacy protection technology framework for the publication, storage, mining and use is proposed. Finally, specific privacy protection technology solutions are proposed for each kinds of Internet identifier data life cycle.