---
id: "u-label"
kind: "glossary-term"
title: "U标签"
language: "zh-Hans"
category: "DNS与技术基础"
updated: "2026-10-10T12:00:00Z"
canonical: "https://tldlog.com/zh/cihui/u-biaoqian/"
translations:
  en: "https://tldlog.com/glossary/u-label/"
  es: "https://tldlog.com/es/glosario/etiqueta-u/"
  de: "https://tldlog.com/de/glossar/u-label/"
  fr: "https://tldlog.com/fr/glossaire/etiquette-u/"
  it: "https://tldlog.com/it/glossario/u-label/"
  pt-BR: "https://tldlog.com/pt/glossario/rotulo-u/"
  ru: "https://tldlog.com/ru/glossariy/u-metka/"
---

# U标签

国际化域名中某一部分供人们阅读和输入的形式，以Unicode字符书写，例如带重音的字母、阿拉伯文或中文。软件在DNS中查询之前，会将其转换为对应的以xn--开头的A标签。

## 相关术语

- [A标签](https://tldlog.com/zh/cihui/a-biaoqian/)
- [Punycode](https://tldlog.com/zh/cihui/punycode/)
- [IDN](https://tldlog.com/zh/cihui/idn/)
- [IDNA2008](https://tldlog.com/zh/cihui/idna2008/)
- [普遍接受](https://tldlog.com/zh/cihui/pubian-jieshou/)