WHOIS协议
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WHOIS协议（RFC 3912）是一种通过TCP 43端口提供域名、IP地址和自治系统注册数据的查询-响应协议。WHOIS最初为纯文本且无需认证，现已大部分被用于结构化访问控制查询的[[rdap|RDAP]]所取代。自2018年以来，受GDPR驱动的信息删除大幅减少了WHOIS响应中可见的个人数据，[[icann|ICANN]]的SSAD框架管理着对非公开数据的访问。
示例
Running `whois example.com` on the command line queries a WHOIS server on port 43 and returns registration information in unstructured plain text.