ECS（EDNS客户端子网）
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EDNS客户端子网（ECS，RFC 7871）是一种[[dns|DNS]]扩展，允许[[dns-resolver|递归解析器]]在向[[authoritative-dns|权威名称服务器]]发送查询时包含客户端IP地址的部分信息。这使CDN和基于地理位置的DNS能够返回距离最终用户（而非解析器）最近的服务器。ECS涉及隐私权衡：它提升了内容分发性能，但会将部分IP数据共享给解析器之外的服务器。
示例
Google's CDN uses ECS to detect that a user in Tokyo is querying via a US-based resolver, and returns Japanese edge server IPs instead of US ones.