IP 地址列表: 231.51.123.* (231.51.123.0 - 231.51.123.254)

這是第壹個字節為231，第二個字節為51，第三個字節為123，第四個字節在0 - 255之間的IP地址列表，表示為231.51.123.* (231.51.123.0 - 231.51.123.255)。

這個IP地址列表中包含256個IP地址，我們以其中壹個IP地址231.51.123.1為例，來描述這個IP的屬性：

第一個 IP 地址示例

但這只是其中1個IP地址的例子，並不代表這個列表中所有的IP地址都有同樣的屬性，如果需要了解其它IP和更詳細的IP地址段信息，請點擊下面列表中的標題鏈接。

內容:

• 1. 第一個 IP 地址示例
• 2. D類IP地址列表
• 3. 最後一個 IP 地址示例

231.51.123.1是一個保留的IP地址。保留的IP地址段不會在互聯網上使用，因此與廣域網相連的路由器在處理保留IP地址時，只是將該數據包丟棄處理，而不會路由到廣域網上去。從而將保留IP地址產生的數據隔離在局域網內部。更多詳情：231.51.123.1。

D類地址的前4位恒為1110，預置前3位為1意味著D類地址開始於128 + 64 + 32 = 224，第4位為0意味著D類地址的最大值為128 + 64 + 32 + 8 + 4 + 2 + 1 = 239。

D類IP地址範圍：224.0.0.0 ~ 239.255.255.255。

D類IPv4地址不區分網絡地址與主機地址。

D類IP地址留給Internet體系結構委員會(IAB)使用，用於多播地址（壹對多通信）。

如果您需要了解D類IP地址段詳情，可以點擊D類IP地址列表中的標題鏈接。

• 231.51.123.0
• 231.51.123.1
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• 231.51.123.255

231.51.123.255是一個保留的IP地址。保留的IP地址段不會在互聯網上使用，因此與廣域網相連的路由器在處理保留IP地址時，只是將該數據包丟棄處理，而不會路由到廣域網上去。從而將保留IP地址產生的數據隔離在局域網內部。更多詳情：231.51.123.255。