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Subnet Masks, in the IP address is part of the host ID.

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How much of the IP address is the network number and how much is the host ID varies according to the subnet mask. Subnet Masks A subnet mask is used to determine which bits are part of the network number, and which bits are part of the host ID (using a logical AND operation). The term "subnet" is short for "sub-network". A subnet mask has 32 bits. If a bit in the subnet mask is a "1" then the corresponding bit in the IP address is part of the network number. If a bit in the subnet mask is "0" then the corresponding bit in the IP address is part of the host ID. The following example shows a subnet mask identifying the network number (in bold text) and host ID of an IP address (192.168.1.2 in decimal). 94

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How much of the IP address is the network number and how much is the host ID varies according

to the subnet mask.

Subnet Masks

A subnet mask is used to determine which bits are part of the network number, and which bits are

part of the host ID (using a logical AND operation). The term “subnet” is short for “sub-network”.

A subnet mask has 32 bits. If a bit in the subnet mask is a “1” then the corresponding bit in the IP

address is part of the network number. If a bit in the subnet mask is “0” then the corresponding bit

in the IP address is part of the host ID.

The following example shows a subnet mask identifying the network number (in bold text) and

host ID of an IP address (192.168.1.2 in decimal).