Subnet Mask

November 29, 2022
A subnet mask is a 32-bit number that divides an IP address into a network address and a host address.

Each device has an IP address consisting of two parts: the client or host address and the server or network address. The subnet mask divides the IP address into host and network addresses, thereby determining which part of the IP address belongs to the device and which part belongs to the network.

Why do we need a subnet mask?

The subnet mask is part of the basic structure that most networks use to communicate between devices. In addition to the mask, this includes an IP address, gateway, or router.

When organizations require additional networks, subnets divide the IP address host element into smaller subnets. The purpose of the mask is to ensure the subnet creation process. Its name came from the fact that the subnet mask uses its own 32-bit number to mask the IP address.

A 32-bit IP address uniquely identifies one device in an IP network. 32 binary bits are divided by a subnet mask into host and network sections, but they are also divided into four 8-bit octets.

Because the binary system is complex, each octet is converted to an expression in dot decimal notation arithmetic. The result is a typical decimal format for IP addresses, for example,

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