This is page is meant as a tutorial for setting up DNS for Google Youtube for Schools.
If you'd like to use moderate restricted YouTube access, use the Target of 220.127.116.11 instead of 18.104.22.168.
Please note, these IP addresses can change at any time and YouTube functionality may break. To get new addresses, run this command: nslookup restrict.youtube.com 22.214.171.124
Your server should look similar to this.