Assigning ipv6 on Mac is as simple as assigning ipv4 address on a Mac. We have gone a step ahead and attached screenshots for making it easier for you to assign Ip address to your Mac computer.
Click “Apple” icon in the computer’s menu bar, and select system preferences option from the Apple menu
Select Network option on the left hand side beneath “internet & Wireless” heading
Now hit the button “Advanced”
Now you can see the ipv6 address, by default it is automatic; if you ever wanted to add ipv6 address manually you can go ahead and select the option “Manually”, and enter the address