> For the complete documentation index, see [llms.txt](https://surge.mitsea.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://surge.mitsea.com/policy-group/subnet.md).

# 子网组

使用子网策略组，你可以根据当前的网络环境自动选择一个策略。你可以使用[子网表达式 (subnet expression)](/rule/subnet.md)作为条件。

`Subnet Group = subnet, default = ProxyHTTP, TYPE:WIFI = ProxyHTTP, SSID:MyHome = ProxySOCKS5`

从 Surge iOS 4.12.0 & Surge Mac 4.5.0 开始，SSID 组现更名为子网组 (Subnet Group)。依然支持 SSID 组的旧语法。你可以使用组类型关键字 `subnet` 或 `ssid` 以保持兼容。

### 参数

#### `default`: 必填

当没有匹配任何子网表达式时的策略。

#### `cellular`: 可选 (已弃用，请改用 `TYPE:CELLULAR`)

蜂窝网络的策略。如果不提供，则将使用默认策略。


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# 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 dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://surge.mitsea.com/policy-group/subnet.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.