What is IP octet?

An IP octet is one of the four parts of an IPv4 address, separated by dots. Each part represents 8 bits (1 byte).

For example, in the IP address 192.168.1.1:

• 192 - first octet
• 168 - second octet
• 1 - third octet
• 1 - fourth octet

The value of each octet ranges from 0 to 255, since 2^8 = 256 possible values (from 00000000 to 11111111 in binary).

Example of binary representation of octets:

• 192 in binary: 11000000
• 168 in binary: 10101000
• 1 in binary: 00000001

Thus, the IP address 192.168.1.1 in binary is 11000000.10101000.00000001.00000001.

Understanding octets is important for:

1. Network address identification: Octets help determine the part of the address related to the network and the part related to the host, depending on the subnet mask.
2. IP address classification: Historically, octets were used to divide IP addresses into classes (A, B, C, D, E).
3. Subnet mask: The subnet mask is also represented as four octets and is used to determine the network part of the IP address.