Abstract: This paper investigates a full day’s worth of queries looking up the CN domain names，which are collected from the authoritative CN root servers run by China Internet Network Information Center.Through theoretical and empirical study，this paper finds that in one day，the frequencies of CN domains will be queried following the Zipf’s-like distribution，however the number of requests issued from hundreds of thousands of DNS cache servers follows the stretched exponential distribution.The above observations suggest strong global centrality among the queries and self-organizing characteristics of the system.

Key words: Domain Name System（DNS）, measurements, Zipf’s-like distribution, stretched exponential distribution, CN ccTLD

摘要： 借助于中国互联网络信息中心负责管理的国家顶级域名系统资源，对当前CN顶级域名DNS服务请求进行了宏观测量和分析。研究发现，CN国家域名整体查询频度特征服从类Zipf’s分布，递归服务器域名查询量遵从广延指数分布，即CN国家域名的DNS服务请求具有整体集中分布的特征和域名查询模式的时间局部特征。这些关于国家域名服务的整体认识和全局性描述对于深入了解我国国家域名系统的整体运行状况，科学认识我国宏观网络发展特征具有重要意义。

关键词: DNS查询, 宏观网络分析, Zipf’s定律, 广延指数分布, .CN国家顶级域