A 记录
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A 记录是将域名直接映射到 IPv4 地址的 [[dns|DNS]] 记录。它是最基础的 DNS 记录类型，任何域名若要通过浏览器访问，都必须有 A 记录。
示例
An A record for example.com pointing to 93.184.216.34 tells browsers which server to contact when visiting that domain.