CIDR子网掩码可用地址数常见用途/32255.255.255.2551 个精确到单台设备 (单个 IP)/31255.255.255.2542 个点对点链路/30255.255.255.2524 个小子网/29255.255.255.2488 个小范围局域网/28255.255.255.24016 个小规模网络/24255.255.255.0256 个C 类网络 (常见局域网)/16255.25

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