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Binary to Decimal

Lesson 2 of 46 in Coddy's IP Addressing and Subnetting course.

Reading binary is the same trick in reverse: add up the place values under every 1.

Take 11000000. The two switched-on positions are worth 128 and 64, so the number is 128 + 64 = 192. That exact byte opens countless subnet masks, which is why it is worth recognizing on sight.

A handy shortcut: when the ones are all packed to the left, the values are always the same familiar sums: 10000000 is 128, 11000000 is 192, 11100000 is 224, 11110000 is 240, and so on up to 255.

Challenge

Beginner

Convert these two bytes to decimal and print each result on its own line, in this order:

11000000
00001010

Expected output:

192
10

Try it yourself

Terminal

All lessons in IP Addressing and Subnetting

1Bits and Binary

Numbers as BitsBinary to DecimalPowers of Two Recap - Binary Warm-up

4CIDR Notation

Goodbye Classes Reading CIDR Block Sizes Recap - CIDR Reading

7Special Addresses

Private Ranges Loopback Link-Local Zero and Broadcast

10Capstone - The Office

The Floor Plan Sizing Each Team Carving the Block The Router's View Recap - Ship the Plan

2IPv4 Anatomy

Four Octets The 32-Bit View Network and Host Valid or Not Recap - Read an Address

5Inside a Subnet

Network Address Broadcast Address Usable Hosts First and Last Host Recap - Subnet Facts

8Planning Networks

Right-Sizing VLSM Step by Step Allocation Order Checking for Overlap Recap - Plan a Network

3The Subnet Mask

What a Mask Does Mask to Prefix Prefix to Mask ANDing It Out Recap - Mask Basics

6Subnetting Drills

The Block Size Trick Which Subnet Am I In Splitting a /24 Splitting Again Recap - Subnetting Drills

9IPv6 First Steps

Why IPv6 Reading IPv6 Prefixes in IPv6 Recap - IPv6 Basics

Practice on your own: Terminal playground