For the vast majority of CodeHS courses and tools, the only domains you need to whitelist are:

*.codehs.com (codehs.com and all subdomains)
*.codehs.me (codehs.me and all subdomains)
*.intercom.io - in-site messenger to reach the CodeHS team for support

Optional:
youtube.com - all CodeHS lesson videos can be streamed from either CodeHS or YouTube, but YouTube provides subtitles, and some lessons include non-CodeHS videos from YouTube.
aframe.io - Virtual Reality library for building VR worlds in the sandbox 

Course specific:
Some of the CodeHS courses pull in resources such as images, videos, and articles from other domains. Most schools we work with have not had issues with these domains, but if you are running into issues, the following is a comprehensive list of external domains used in CodeHS courses:

Virtual Reality
aframe.io
cdn.rawgit.com
medicalfuturist.com
www.raconteur.net
commons.wikimedia.org
c1.staticflickr.com
www.flickr.com

AP CS Principles

*. wikipedia.org
*.cloudfront.net
cl.ly
projects.fivethirtyeight.com
goo.gl
www.google.com
wwwnc.cdc.gov
www.gapminder.org
www.betterbuys.com

Cybersecurity
www.huffingtonpost.com
www.google.com
www.anf.es
passwordsgenerator.net
s3-us-west-2.amazonaws.com
creativecommons.org
threatmap.checkpoint.com
onlinedegrees.sandiego.edu
abcnews.go.com
www.google.de
hack-yourself-first.com
xss-game.appspot.com
blog.vrypan.net
www.comparitech.com
nakedsecurity.sophos.com

Web Design
www.w3schools.com
maxcdn.bootstrapcdn.com
*.getbootstrap.com
ajax.googleapis.com
www.publicdomainpictures.net
pixabay.com
creativecommons.org
*.wikipedia.org
*. wikimedia.org
*.cloudfront.net
cl.ly
www.google.com
whichbrowser.net
s3.amazonaws.com
medium.com
animals.nationalgeographic.com
visual.ly
onenyc.cityofnewyork.us
1stwebdesigner.com
designshack.net
www.sfarts.org
www.washington.edu
www.walmart.com
www.bbc.com
www.betatakaki.com
www.sessions.edu
www.usatoday.com
www.betterbuys.com
science.howstuffworks.com
placekitten.com
glyphicons.com
t.co

Computing Ideas
*. wikipedia.org
*.cloudfront.net
cl.ly
goo.gl
i.imgur.com
www.computer.org
sketch.io
www.w3.org

Introduction to the Internet
*. wikipedia.org
*.cloudfront.net
cl.ly
goo.gl
i.imgur.com
www.computer.org
sketch.io
www.w3.org

World of Computing
*. wikipedia.org
*.cloudfront.net
cl.ly
goo.gl
i.imgur.com
www.computer.org
sketch.io
www.w3.org

Creative Computing
*. wikipedia.org
*.cloudfront.net
cl.ly
goo.gl
i.imgur.com
www.computer.org
sketch.io
www.w3.org

All other courses
None

Did this answer your question?