What does subnet mask 255.255.255. mean?

Subnet mask 255.255.255.0 means: Subnet number: 24 Host bits: 8 Subnet range: 256 Hosts Broadcast address: network address.255 Valid host range: network address.1 To the network address.254

##The meaning of subnet mask 255.255.255.0

1. Number of subnet digits:

255.255.255.0 represents 3 8-bit bytes (24 bits ) are all 1. This means that the first 24 bits of the IP address are used to identify the subnet.

2. Host number:

The remaining 8 bytes (8 bits) are used to identify the host within the subnet.

3. Subnet range:

A network using subnet mask 255.255.255.0 can contain 2^8 = 256 hosts, Because the host ID part can be from 0 to 255.

4. Broadcast address:

All addresses in the subnet whose host ID bits are 1 are broadcast addresses. For subnet mask 255.255.255.0, the broadcast address is:

<code>网络地址.255</code>

5. Valid host range:

The effective host range is the address range that can be assigned to hosts in the subnet, excluding network addresses and broadcast addresses. For the subnet mask 255.255.255.0, the valid host range is:

<code>网络地址.1 至 网络地址.254</code>

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