RDAP（注册数据访问协议）
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RDAP 是[[whois|WHOIS]]的现代替代方案，通过 HTTPS 以结构化 JSON 格式提供域名注册数据，支持国际化、访问控制和标准化错误响应。
示例
Querying RDAP for example.com returns structured JSON with registration data, unlike WHOIS's plain-text format.