Four Octets

Lesson 5 of 46 in Coddy's IP Addressing and Subnetting course.

An IPv4 address is 32 bits, but nobody wants to read 32 bits in a row. So we chop it into four bytes, called octets, convert each to decimal, and join them with dots: 192.168.1.1. That format is called dotted decimal.

The dots are purely for humans. To the network, 192.168.1.1 is one continuous binary number: 11000000 10101000 00000001 00000001.

Because each octet is one byte, every octet runs from 0 to 255. You will never see 300 in a real address.

Challenge

Beginner

Here is an address in binary, one octet per group:

11000000.10101000.00000001.00000001

Convert each octet to decimal and print the address in dotted decimal.

Expected output:

192.168.1.1

Try it yourself

Terminal

All lessons in IP Addressing and Subnetting

1Bits and Binary

Numbers as Bits Binary to Decimal Powers 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 OctetsThe 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