ASCII TLD
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ASCII TLD是完全由ASCII字符集（A至Z、0至9和连字符）组成的[[tld|顶级域]]，与使用非拉丁文字的[[idn-tld|IDN TLD]]相对。根区中绝大多数TLD都是基于ASCII的。ASCII TLD与所有[[dns|DNS]]软件原生兼容，无需特殊编码，而IDN TLD在通过DNS基础设施传输时必须转换为其[[punycode|Punycode]]表示形式（如xn--...）。
示例
.com, .org, and .shop are ASCII TLDs; by contrast, .中国 (China) is an IDN TLD that is transmitted as .xn--fiqs8s through the DNS.