多路径DNS（mDNS）
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多路径DNS最常见的实现形式是mDNS（多播DNS，RFC 6762），它允许局域网内的设备无需集中式[[dns|DNS]]服务器，通过向局域网子网内所有设备广播查询来发现和解析主机名。.local伪TLD为mDNS专用保留，不应在公共DNS中被委托。mDNS已在Apple的Bonjour、Linux的Avahi和Windows 10+中实现，是AirDrop、Chromecast和智能家居设备等零配置网络（Zeroconf）的基础。
示例
When you print to printer.local on a Mac, Bonjour uses mDNS to broadcast a query over the local network. The printer responds with its IP address, and the Mac connects — no DNS server required.