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

# TTL

生存时间

附在每条DNS记录上的一个数值，以秒为单位。它告诉解析器在重新查询之前可以将缓存副本保留多久。TTL较长意味着变更（例如迁移网站）可能需要更长时间才能传达到所有用户。

## 相关术语

- [解析器](https://tldlog.com/zh/cihui/jiexiqi/)
- [区域文件](https://tldlog.com/zh/cihui/quyu-wenjian/)
- [DNS](https://tldlog.com/zh/cihui/dns/)