In what octet of an Internet Protocol (IP) address can you identify the class of the address?

The class of an Internet Protocol (IP) address can be identified in the first octet of the address. This first octet serves as a key indicator of the address class—Classes A, B, C, D, and E are determined based on the value of the first octet.

For example:

• Class A addresses have a first octet that ranges from 0 to 127.

• Class B addresses range from 128 to 191.

• Class C addresses range from 192 to 223.

• Class D is used for multicast addresses and ranges from 224 to 239.

• Class E is reserved for experimental use, ranging from 240 to 255.

The determination of the class based on the first octet is crucial for routing decisions and network design. As a result, understanding the role of the first octet not only helps identify the class of an IP address but also aids in managing IP address allocation and ensuring proper network configuration.