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 188.8.131.52 instead of 184.108.40.206.
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 220.127.116.11
Your server should look similar to this.