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Target customers: 1. Corporate groups, for example, a large corporate group with multiple subsidiaries where each subsidiary has an independently managed secondary subdomain. 2. Multinational corporations, for example, multinational companies that has branches in multiple countries where each branch uses an independently managed secondary subdomain. Features released: Alibaba Cloud DNS supports subdomain authorization management to facilitate independent management of secondary and tertiary subdomains under the primary domain. The primary domain and its corresponding subdomains can belong to different Alibaba cloud accounts. The hierarchical authorization of subdomains allows for granting of DNS management permissions to subsidiaries or lines of business. This helps you significantly improve the efficiency and flexibility of DNS O&M management for large enterprises while following the principle of least privilege.