Why IPv6

Lesson 38 of 46 in Coddy's IP Addressing and Subnetting course.

IPv4 has about 4.3 billion addresses, and the world ran out. IPv6 fixes the shortage with brute force: 128 bits per address instead of 32.

The notation changes with it: eight groups of four hex digits, joined by colons. The loopback address, IPv6's answer to 127.0.0.1, is one bit at the very end and zeros everywhere else: 0000:0000:0000:0000:0000:0000:0000:0001.

Nobody writes all that out, and the next lesson shows the shortcuts. But you must be able to expand any shortened address back to this full form.

Challenge

Beginner

Print the IPv6 loopback address in its full form: all eight groups, all four digits each.

Expected output:

0000:0000:0000:0000:0000:0000:0000:0001

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 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 IPv6Reading IPv6 Prefixes in IPv6 Recap - IPv6 Basics

Practice on your own: Terminal playground