I am kinda new to the whole subnetting thing. I am learning and as such came across this comment: The binary arithmetic involved in using CIDR block addressing is painful. It is much easier to start with another private network address space, say 172.16.0.0, and use the third byte to represent internal subnets: 172.16.1.0, 172.16.2.0, 172.16.3.0, and so on. Now you use the default ( or "classful") subnet mask of 255.255.255.0 (or /24) and each subnet includes 254 host addresses. See how much easier it is to start with a Class B (/16) network, and split it into 254 Class Cs (/24)? Perhaps the designers of TCP/IP weren't so dumb after all when they chose to use byte boundaries in the initial network addressing scheme I am not sure I see how it is easier using the numbers with the example above.