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description: CIDR Classless Inter-Domain Routing 概念解析
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# CIDR
CIDR无类别域间路由Classless Inter-Domain Routing是一个在Internet上创建附加地址的方法这些地址提供给服务提供商ISP再由ISP分配给客户。CIDR将路由集中起来使一个IP地址代表主要骨干提供商服务的几千个IP地址从而减轻Internet路由器的负担。
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## 参考文档
* [CIDR 计算](https://cloud.tencent.com/developer/article/1151790)
* [CIDR to IPv4 Conversion](https://www.ipaddressguide.com/cidr)
* [CIDR to IPv4 Conversion](https://www.ipaddressguide.com/cidr)