# Introduction to IPv6

**URL:** https://forum.networklessons.com/t/introduction-to-ipv6/896
**Category:** Lessons Discussion
**Created:** [December 22, 2016, 12:38am UTC](https://forum.networklessons.com/t/introduction-to-ipv6/896 "2016-12-22T00:38:31Z")
**Posts on this page:** 1
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### Author: ![ReneMolenaar](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/renemolenaar/32/488_2.png) [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [October 23, 2013, 9:17am UTC](https://forum.networklessons.com/t/introduction-to-ipv6/896/3 "2013-10-23T09:17:19Z")

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Hi Towdie,

In reality the router does one more thing when creating the IPv6 address using EUI-64. The MAC address is chopped in two pieces but it will also “flip” the 7th bit. When it’s a 0 it will make it a 1 and the other way around. Here’s an example for the MAC address I used in this tutorial:

CC0A.180E.0000

Each hexadecimal character represents 4 binary bits:

C = 1100  
C = 1100  
0 = 0000  
A = 1010

Let’s put “CC” in binary behind each other:

11001100

EUI-64 will flip the 7th bit of this address so it will become:

110011 **1** 0

Let’s calculate that back to hexadecimal:

1100 = C  
1110 = E

So the first part becomes CE0A. I’ll create a tutorial for this process and the reason behind it later on, but hopefully this explains the outcome of the address.

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