> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/hacking-tools/calculators.md).

# 计算器

用于子网划分、Linux 权限和 cron 表达式的实用计算器中心，采用可搜索的 GitBook 表格和快速排查笔记。

本节汇总了用于常见渗透测试和系统管理任务的快速查询计算器。每个页面都使用可搜索的 GitBook 表格，因此你可以输入所需的值并直接跳转到结果。

## 计算器索引

<table data-view="cards" data-full-width="false" data-search="true"><thead><tr><th></th><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><h3><i class="fa-network-wired" style="color:$primary;">:network-wired:</i></h3></td><td><h4>子网划分计算器</h4></td><td>搜索 CIDR 范围、子网掩码、通配符掩码、主机数量、块大小以及子网划分示例。</td><td><a href="/zh/hacking-tools/calculators/subnetting-calculator.md">子网划分计算器</a></td></tr><tr><td><h3><i class="fa-key" style="color:$primary;">:key:</i></h3></td><td><h4>Linux 权限计算器</h4></td><td>将八进制权限转换为符号表示法，查看 SUID/SGID/粘滞位，并识别提权影响。</td><td><a href="/zh/privesc/permissions/linux-permissions-calculator.md">Linux 权限计算器</a></td></tr><tr><td><h3><i class="fa-clock" style="color:$primary;">:clock:</i></h3></td><td><h4>Cron 表达式计算器</h4></td><td>搜索常见的 cron 表达式，阅读其含义，并查看 cron 提权检查。</td><td><a href="/zh/privesc/cron-jobs/cron-expression-calculator.md">Cron 表达式计算器</a></td></tr></tbody></table>

## 快速用法

| 需要         | 搜索内容                                  |
| ---------- | ------------------------------------- |
| 网络掩码和主机数量  | `/24`, `/27`, `/30`                   |
| Linux 权限转换 | `755`, `644`, `4755`, `rwxr-xr-x`     |
| Cron 计划含义  | `*/5 * * * *`, `0 0 * * *`, `@reboot` |


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://hacking-notes.jord4n.pro/zh/hacking-tools/calculators.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.