域名系统
域名系统（英语：Domain Name System，缩写：DNS）是互联网个一项服务。渠作为拿域名搭IP地址相互映射个一个分布式数据库，能够让人更方便地访问互联网。DNS使用TCP搭UDP端口53。当前，对于每一级域名长度个限制是63个字符，域名总长度则弗能超过253个字符。
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