Subnet Mask

Subnet Mask and CIDR Notation

CIDR Notation

The /25 notation means that 25 bits of the IP address are used for the network portion.

The remaining 7 bits are used for the host portion.

Subnet Mask

A subnet mask is a 32-bit number that helps identify which part of the IP address is the network and which part is the host.

For a /25 network:

The first 25 bits are set to 1 (network bits).

The remaining 7 bits are set to 0 (host bits).

Subnet Mask in Decimal Notation

The subnet mask for a /25 network is 255.255.255.128.

Binary Representation: 11111111.11111111.11111111.10000000

Decimal Representation: 255.255.255.128

Difference Between Subnet Mask and CIDR Notation

Subnet Mask: A 32-bit number used to separate the network and host portions of an IP address. It is often expressed in decimal form (e.g., 255.255.255.128).

CIDR Notation: A concise way to express the subnet mask by indicating the number of bits used for the network portion (e.g., /25).

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