![]() In standard classful addressing, Class A addresses devote one byte to the network ID and three bytes to the host ID. Dotted-decimal notation lets you examine an IP address one byte at a time. Although computers store IP addresses in binary format, you typically write them in dotted-decimal notation because it's easier to read. IP addresses are 32 bits, or four 8-bit bytes, in length. ![]() You can apply what you know about binary numbers to IP addresses and subnet masks. Given this information, you can convert the binary number 11010011 to decimal as follows. Let's first review the powers of 2 (we're only going to go as far as we need to for an 8-bit byte because IP addresses have 8-bit bytes). You interpret binary (base 2) numbers the same way as you do decimal numbers, except that each column of a binary number represents a different power of 2 rather than 10. Each digit in a decimal number stands for a different power of 10. Let's start with something that we're all pretty comfortable with-namely, decimal (base 10) numbers. To truly understand how to derive IP subnet masks and apply them to addresses, you must understand binary numbers and how to convert them to decimal numbers.
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