互联网上的域名可谓千姿百态，从域名的结构来划分
Internet域名是Internet网络上的一个服务器或一个网络系统的名字，在全世界，没有重复的域名。域名的形式是以若干个英文字母或数字组成，由“．”分隔成几部分。
互联网上的域名可谓千姿百态，但从域名的结构来划分，总体上可把域名分成两类，一类称为“国际顶级域名”（简称“国际域名”），一类称为“国内域名”。
一般国际域名的最后一个后缀是一些诸如．com，．net，．gov，．edu的“国际通用域”，这些不同的后缀分别代表了不同的机构性质。比如．com表示的是商业机构，．net表示的是网络服务机构，．gov表示的是政府机构，．edu表示的是教育机构。
国内域名的后缀通常要包括“国际通用域”和“国家域”两部分，而且要以“国家域”作为最后一个后缀。以ISO31660为规范，各个国家都有自己固定的国家域。
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