> For the complete documentation index, see [llms.txt](https://docs.console.zenlayer.com/welcome/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.console.zenlayer.com/welcome/cn/ip-transit/manage-ip-transit/change-cidr-block.md).

# 更改 CIDR 地址块

## 前提条件

* 实例状态为**运行中**。

## 操作步骤

1. 单击 IP Transit 名称，然后导航至 **Information** > **CIDR 地址块** > **添加 CIDR 地址块**。

   <figure><img src="/files/kIEJRmlTY8kM6OXWVjj8" alt=""><figcaption></figcaption></figure>
2. 选择 IP 类型和地址块大小，查看价格并确认。

   <div align="left"><figure><img src="/files/QFstnW9wpnpxOBcx7fRc" alt="" width="302"><figcaption></figcaption></figure></div>

## 结果

新的 CIDR 地址块出现在列表中。

{% hint style="info" %} <mark style="color:blue;">**注意**</mark>

* <mark style="color:blue;">您需要至少一个公网 CIDR 地址块。只有在配置了至少两个 CIDR 地址块的情况下，才允许删除。</mark>
* <mark style="color:blue;">IP Transit 处于处理状态时，您无法执行任何操作。</mark>
  {% endhint %}


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