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This article mainly introduces php how to find a network segment start and end IP address, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

The details are as follows:

For example, the subnet mask of the network segment (192 168.1.5 take 24) is divided into:

11111111.1111111111111111.00000000 (255.255.255.0)

Description: the IP address is 32 bits, which means that there are 24 1s and 8 zeros in the division of the network segment.

The algorithm to start the IP address is the and operation of the binary of 192.168.1.5 and the binary of the subnet mask.

The algorithm to end the IP address is to reverse the binary of the subnet mask and then perform an OR operation with the binary of 192.168.1.5.

In practice, the network address and broadcast address are obtained. The network address + 1 is the first host address, and the broadcast address-1 is the last host address.

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