A /24 (255.255.255.0) gives you 256 total addresses, but only 254 usable hosts (we subtract the network ID and broadcast address).
You might ask: “Why a PDF? Why not just use an online calculator?” ip subnetting from zero to guru pdf
To find the network ranges without a calculator, follow these steps for any mask: A /24 (255
Each number is double the one to its right. If a bit is "1," you add the value. If it's "0," you skip it. 11000000 = 128 + 64 = 192 . 3. Classful vs. Classless Networking ip subnetting from zero to guru pdf